PIC18 Series Family Instructions Quick Index

N = Z = C = 0; Assume that the status registers are all 0.

After execution:

REG = 0000 0000; the value of the REG register is 00000000.

W = 0000 0000; the value of W register is 00000000.

Z = C = 1; Since the result after shifting to the left is 0, the zero flag Z is 1; the carry flag C is 1.

Command name: RLNCF

Original meaning: Rotate Left f (no Carry)

Syntax: [label] RLNCF f, d

Operator:

Operation description: (f < n >) -> dest ,

     (f < 7 >) -> 7,

Impact flags: N, Z

Instruction description: Rotate the value in the REG temporary memory to the left. If d = 0, the result after the operation is placed in the W accumulator; if d = 1, the result after the operation is placed in the f temporary register. If the temporary register storing the operation result is stored in the W accumulator, We can also write it as W (table W accumulator); if the temporary register storing the operation result is stored in the temporary register, we can also write it as F (table temporary register).

Category: Logical operation instructions.

Group: Logic instructions.

Example 1:

RLNCF REG, 0; Rotate the value of the REG register to the left and store the result back into the W register.

Before execution:

REG = 1110 0110; the value of the REG register is 11100110.

N = Z = 0; Assume that the status registers are all 0.

After execution:

REG = 1110 0110; the value of the REG register is 11100110.

W = 1100 1100; the value of W register is 11001100.

N = 1; Since moving to the left means more negative numbers, the negative flag N is 1.

Example 2:

RLNCF REG, F; Rotate the value of the REG register to the left and store the result back into the REG register.

Before execution:

REG = 1000 0000; the value of the REG register is 10000000.

W = 0000 0000; the value of W register is 00000000.

N = Z = 0; Assume that the status registers are all 0.

After execution:

REG = 0000 0000; the value of the REG register is 00000000.

W = 0000 0000; the value of W register is 00000000.

Z = 1; Since the result after shifting to the left is 0, the zero flag Z is 1.

Command name: RRCF

Original meaning: Rotate Right f through Carry

Syntax: [label] RRCF f, d

Operator:

Operation description: (f < n >) -> dest ,

     (f < 7 >) -> 7,

     ( C ) -> dest <0 >

Impact flags: C, N, Z

Instruction description: Rotate the value in the REG temporary memory to the right together with the carry flag C. If d = 0, the result after the operation is placed in the W accumulator; if d = 1, the result after the operation is placed in the f temporary register. If the temporary register storing the operation result is stored in the W accumulator, We can also write it as W (table W accumulator); if the temporary register storing the operation result is stored in the temporary register, we can also write it as F (table temporary register).

Category: Logical operation instructions.

Group: Logic instructions.

Example 1:

RRCF REG, 0; Rotate the value of the REG register to the right together with the carry flag C, and store the result back into the W register.

Before execution:

REG = 1110 0110; the value of the REG register is 11100110.

N = Z = 0; Assume that the negative flag N and the zero flag Z in the status register are both 0.

C = 1; Assume that the carry flag C is 1.

After execution:

REG = 1110 0110; the value of the REG register is 11100110.

W = 1111 0011; the value of W register is 11110011.

N = Z = C = 0; the negative flag N, zero flag Z and carry flag C in the status register all result in 0.

Example 2:

CLRC; Clear the carry flag C to 0.

RRCF REG, F; Rotate the value of the REG register to the left together with the carry flag C, and store the result back into the REG register.

Before execution:

REG = 0000 0001; the value of the REG register is 00000001.

W = 0000 0000; the value of W register is 00000000.

N = Z = C = 0; the negative flag N, zero flag Z and carry flag C in the status register are all 0.

After execution:

REG = 0000 0000; the value of the REG register is 00000000.

W = 0000 0000; the value of W register is 00000000.

Z = C = 1; Since the result after shifting to the left is 0, the zero flag Z is 1; the carry flag C is 1.

N = 0; the negative flag N is 0.

Command name: RRNCF

Original meaning: Rotate Right f (no Carry)

Syntax: [label] RRNCF f, d

Operator:

Operation description: (f < n >) -> dest ,

     (f < 7 >) -> 7,

Impact flags: N, Z

Instruction description: Rotate the value in the REG temporary memory to the right. If d = 0, the result after the operation is placed in the W accumulator; if d = 1, the result after the operation is placed in the f temporary register. If the temporary register storing the operation result is stored in the W accumulator, We can also write it as W (table W accumulator); if the temporary register storing the operation result is stored in the temporary register, we can also write it as F (table temporary register).

Category: Logical operation instructions.

Group: Logic instructions.

Example 1:

RRNCF REG, 0; Rotate the value of the REG register to the right and store the result back into the W register.

Before execution:

REG = 1110 0110; the value of the REG register is 11100110.

N = Z = 0; Assume that the status registers are all 0.

After execution:

REG = 1110 0110; the value of the REG register is 11100110.

W = 0111 0011; the value of W register is 11001100.

N = Z = 0; both the negative flag N and the zero flag are 0.

Example 2:

RRNCF REG, F; Rotate the value of the REG register to the right and store the result back into the REG register.

Before execution:

REG = 0000 0001; the value of the REG register is 00000001.

W = 0000 0000; the value of W register is 00000000.

N = Z = 0; Assume that the status registers are all 0.

After execution:

REG = 0000 0001; the value of the REG register is 00000001.

W = 0000 0000; the value of W register is 00000000.

Z = 1; Since the result after shifting to the right is 0, the zero flag Z is 1.

N = 0; the negative flag N is 0.

Command name: SETF

Original meaning: Set f

Syntax: [label] SETF f

Operator:

Operation description: 0xFF -> f

Impact flags: None

Instruction description: Set all values ​​in the REG temporary memory to 1.

Category: Data transfer instructions.

Group: Bit setting instructions.

Example 1:

SETF REG; Set all values ​​in the REG register to 1.

Before execution:

REG = 1110 0110; the value of the REG register is 11100110.

After execution:

REG = 1111 1111; the value of the REG register is 11111111.

Command name: SLEEP

Original meaning: Enter SLEEP Mode

Syntax: [label] SLEEP

Operator:

Operation description: 0x00 -> WDT,

0 -> WDT post divider,

,

Impact flags:

Instruction description: CPU enters sleep state.

Category: Program flow control instructions.

Group: Program flow instructions.

Example 1:

SLEEP; Set the CPU to enter sleep state.

Before execution:

     ; The value of AND is unknown.

After execution:

     ; The value of the temporary register is 1.

     ; The value of the temporary register is 0.

Command name: SUBFWB

Original meaning: Subtract f From W with Borrow

Syntax: [label] SUBFWB f, d, a

Operator:

Operation description: (W) – (f) – ( ​​) -> dest

Impact flags: N, OV, C, DC, Z

Instruction description: Subtract the f register and carry flag C from the value of the W accumulator. If d = 0, the result of the operation is placed in the W accumulator; if d = 1, the result of the operation is placed in f. In the temporary register, if the temporary register that stores the operation result is stored in the W accumulator, we can also write it as W (meaning W accumulator); if the temporary register that stores the operation result is stored in the temporary register, we can also It can be written as F (table register). If a = 0, the result of the operation is placed in the current RAM address; if a = 1, the result of the operation is placed in the RAM address specified by the BSR register.

Category: Data transfer instructions.

Group: Math subtraction instructions.

Example 1:

SUBFWB REG, F, 0; Subtract the REG register and carry flag C from the value of the W accumulator, and put the result of the operation into the REG register.

Before execution:

REG = 3; the value of the REG register is 3.

W = 2; the value of W accumulator is 2.

C = 1; the value of the carry flag C is 1.

After execution:

REG = 0xFF; the value of the REG register is 0xFF.

W = 2; the value of W accumulator is 2.

C = 0; the value of the carry flag C is 0.

Z = 0; the value of zero flag Z is 0.

N = 1; the value of negative flag N is 1.

²The result of the operation is negative.

Example 2:

SUBFWB REG, W, 0; subtract the REG register and carry flag C from the value of the W accumulator, and put the result of the operation into the W accumulator.

Before execution:

REG = 2; the value of the REG register is 2.

W = 5; the value of W accumulator is 5.

C = 1; the value of the carry flag C is 1.

After execution:

REG = 2; the value of the REG register is 2.

W = 3; the value of W accumulator is 3.

C = 1; the value of the carry flag C is 1.

Z = 0; the value of zero flag Z is 0.

N = 0; the value of negative flag N is 0.

²The result of the operation is positive.

Example three:

SUBFWB REG, F, 0; Subtract the REG register and carry flag C from the value of the W accumulator, and put the result of the operation into the REG register.

Before execution:

REG = 1; the value of the REG register is 1.

W = 2; the value of W accumulator is 2.

C = 0; the value of the carry flag C is 0.

After execution:

REG = 0; the value of the REG register is 0.

W = 2; the value of W accumulator is 2.

C = 1; the value of the carry flag C is 1.

Z = 1; the value of zero flag Z is 1.

N = 0; the value of negative flag N is 0.

²The result of the operation is zero.

Command name: SUBLW

Original meaning: Subtract W From Literal

Syntax: [label] SUBLW k

Operator:

Operation description: k – (W) -> W

Impact flags: N, OV, C, DC, Z

Instruction description: Subtract the constant k from the value of the W accumulator and put the result back into the W accumulator.

Category: Immediate constant addressing method.

Group: Math subtraction instructions.

Example 1:

SUBLW 0x02; Subtract 0x02 from the value of the W accumulator and put the result back into the W accumulator.