AT89LV55_06 datasheet, PDF - EEWORLD Datasheet

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AT89LV55_06: Description8-bit Microcontroller with 20K Bytes Flash; File Size533KB，32 Pages; ManufacturerAtmel (Microchip)

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AT89LV55_06 Overview

8-bit Microcontroller with 20K Bytes Flash

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Features

•

Compatible with MCS

-51 Products

•

20K Bytes of Reprogrammable Flash Memory

•

– Endurance: 1,000 Write/Erase Cycles

Fully Static Operation: 0 Hz to 12 MHz

Three-level Program Memory Lock

256 x 8-bit Internal RAM

32 Programmable I/O Lines

Three 16-bit Timer/Counters

Eight Interrupt Sources

Low-power Idle and Power-down Modes

2.7V to 6.0V Operating Range

1. Description

The AT89LV55 is a low-voltage, low-power CMOS 8-bit microcontroller with 20K bytes

of Flash programmable and erasable read-only memory. The device is manufactured

using Atmel’s high-density nonvolatile memory technology and is compatible with the

industry-standard 80C51 instruction set and pinout. The on-chip Flash allows the pro-

gram memory to be reprogrammed. By combining a versatile 8-bit CPU with Flash on

a monolithic chip, the Atmel AT89LV55 is a powerful microcontroller which provides a

highly-flexible and cost-effective solution to many embedded control applications.

The AT89LV55 provides the following standard features: 20K bytes of Flash,

256 bytes of RAM, 32 I/O lines, three 16-bit timer/counters, a six-vector two-level

interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In

addition, the AT89LV55 is designed with static logic for operation down to zero fre-

quency and supports two software selectable power saving modes. The Idle Mode

stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt sys-

tem to continue functioning. The Power-down Mode saves the RAM contents but

freezes the oscillator, disabling all other chip functions until the next hardware reset.

The low-voltage option saves power and operates with a 2.7-volt power supply.

8-bit

Microcontroller

with 20K Bytes

Flash

AT89LV55

0811D–MICRO–3/06

4. Pin Description

4.1

Supply voltage.

4.2

GND

Ground.

4.3

Port 0

Port 0 is an 8-bit open drain bi-directional I/O port. As an output port, each pin can sink eight TTL

inputs. When 1s are written to port 0 pins, the pins can be used as high-impedance inputs.

Port 0 can also be configured to be the multiplexed low-order address/data bus during accesses

to external program and data memory. In this mode, P0 has internal pullups.

Port 0 also receives the code bytes during Flash programming and outputs the code bytes dur-

ing program verification.

External pullups are required during program verification.

4.4

Port 1

Port 1 is an 8-bit bi-directional I/O port with internal pullups. The Port 1 output buffers can

sink/source four TTL inputs. When 1s are written to Port 1 pins, they are pulled high by the inter-

nal pullups and can be used as inputs. As inputs, Port 1 pins that are externally being pulled low

will source current (I

) because of the internal pullups.

In addition, P1.0 and P1.1 can be configured to be the timer/counter 2 external count input

(P1.0/T2) and the timer/counter 2 trigger input (P1.1/T2EX), respectively, as shown in the follow-

ing table.

Port Pin

P1.0

P1.1

Alternate Functions

T2 (external count input to Timer/Counter 2), clock-out

T2EX (Timer/Counter 2 capture/reload trigger and direction control)

Port 1 also receives the low-order address bytes during Flash programming and verification.

4.5

Port 2

Port 2 is an 8-bit bi-directional I/O port with internal pullups. The Port 2 output buffers can

sink/source four TTL inputs. When 1s are written to Port 2 pins, they are pulled high by the inter-

nal pullups and can be used as inputs. As inputs, Port 2 pins that are externally being pulled low

will source current (I

) because of the internal pullups.

Port 2 emits the high-order address byte during fetches from external program memory and dur-

ing accesses to external data memory that use 16-bit addresses (MOVX @ DPTR). In this

application, Port 2 uses strong internal pullups when emitting 1s. During accesses to external

data memory that use 8-bit addresses (MOVX @ RI), Port 2 emits the contents of the P2 Special

Function Register.

Port 2 also receives the high-order address bits and some control signals during Flash program-

ming and verification.

AT89LV55

0811D–MICRO–3/06

AT89LV55

4.6

Port 3

Port 3 is an 8-bit bi-directional I/O port with internal pullups. The Port 3 output buffers can

sink/source four TTL inputs. When 1s are written to Port 3 pins, they are pulled high by the inter-

nal pullups and can be used as inputs. As inputs, Port 3 pins that are externally being pulled low

will source current (I

) because of the pullups.

Port 3 also serves the functions of various special features of the AT89LV55, as shown in the

following table.

Port Pin

P3.0

P3.1

P3.2

P3.3

P3.4

P3.5

P3.6

P3.7

Alternate Functions

RXD (serial input port)

TXD (serial output port)

INT0 (external interrupt 0)

INT1 (external interrupt 1)

T0 (timer 0 external input)

T1 (timer 1 external input)

WR (external data memory write strobe)

RD (external data memory read strobe)

Port 3 also receives the highest-order address bit and some control signals for Flash program-

ming and verification.

4.7

RST

Reset input. A high on this pin for two machine cycles while the oscillator is running resets the

device.

4.8

ALE/PROG

Address Latch Enable is an output pulse for latching the low byte of the address during

accesses to external memory. This pin is also the program pulse input (PROG) during Flash

programming.

In normal operation, ALE is emitted at a constant rate of 1/6 the oscillator frequency and may be

used for external timing or clocking purposes. Note, however, that one ALE pulse is skipped dur-

ing each access to external data memory.

If desired, ALE operation can be disabled by setting bit 0 of SFR location 8EH. With the bit set,

ALE is active only during a MOVX or MOVC instruction. Otherwise, the pin is weakly pulled high.

Setting the ALE-disable bit has no effect if the microcontroller is in external execution mode.

4.9

PSEN

Program Store Enable is the read strobe to external program memory.

When the AT89LV55 is executing code from external program memory, PSEN is activated twice

each machine cycle, except that two PSEN activations are skipped during each access to exter-

nal data memory.

0811D–MICRO–3/06

AT89LV55_06 Related Products

	AT89LV55_06	AT89LV55-12PI	AT89LV55-12AI	AT89LV55-12JI
Description	8-bit Microcontroller with 20K Bytes Flash	8-bit Microcontroller with 20K Bytes Flash	8-bit Microcontroller with 20K Bytes Flash	8-bit Microcontroller with 20K Bytes Flash
Is it Rohs certified?	-	incompatible	incompatible	incompatible
Maker	-	Atmel (Microchip)	Atmel (Microchip)	Atmel (Microchip)
Parts packaging code	-	DIP	QFP	LPCC
package instruction	-	DIP, DIP40,.6	TQFP, TQFP44,.47SQ,32	QCCJ, LDCC44,.7SQ
Contacts	-	40	44	44
Reach Compliance Code	-	unknow	unknow	unknow
Has ADC	-	NO	NO	NO
Address bus width	-	16	16	16
bit size	-	8	8	8
CPU series	-	8051	8051	8051
maximum clock frequency	-	12 MHz	12 MHz	12 MHz
DAC channel	-	NO	NO	NO
DMA channel	-	NO	NO	NO
External data bus width	-	8	8	8
JESD-30 code	-	R-PDIP-T40	S-PQFP-G44	S-PQCC-J44
JESD-609 code	-	e0	e0	e0
length	-	52.324 mm	10 mm	16.586 mm
Number of I/O lines	-	32	32	32
Number of terminals	-	40	44	44
Maximum operating temperature	-	85 °C	85 °C	85 °C
Minimum operating temperature	-	-40 °C	-40 °C	-40 °C
PWM channel	-	NO	NO	NO
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	DIP	TQFP	QCCJ
Encapsulate equivalent code	-	DIP40,.6	TQFP44,.47SQ,32	LDCC44,.7SQ
Package shape	-	RECTANGULAR	SQUARE	SQUARE
Package form	-	IN-LINE	FLATPACK, THIN PROFILE	CHIP CARRIER
Peak Reflow Temperature (Celsius)	-	NOT SPECIFIED	240	225
power supply	-	3/5 V	3/5 V	3/5 V
Certification status	-	Not Qualified	Not Qualified	Not Qualified
RAM (bytes)	-	256	256	256
rom(word)	-	20480	20480	20480
ROM programmability	-	FLASH	FLASH	FLASH
Maximum seat height	-	4.826 mm	1.2 mm	4.572 mm
speed	-	12 MHz	12 MHz	12 MHz
Maximum slew rate	-	25 mA	25 mA	25 mA
Maximum supply voltage	-	6 V	6 V	6 V
Minimum supply voltage	-	2.7 V	2.7 V	2.7 V
Nominal supply voltage	-	3 V	3 V	3 V
surface mount	-	NO	YES	YES
technology	-	CMOS	CMOS	CMOS
Temperature level	-	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
Terminal surface	-	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)
Terminal form	-	THROUGH-HOLE	GULL WING	J BEND
Terminal pitch	-	2.54 mm	0.8 mm	1.27 mm
Terminal location	-	DUAL	QUAD	QUAD
Maximum time at peak reflow temperature	-	NOT SPECIFIED	30	30
width	-	15.24 mm	10 mm	16.586 mm
uPs/uCs/peripheral integrated circuit type	-	MICROCONTROLLER	MICROCONTROLLER	MICROCONTROLLER

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