PCON power management register structure:
PCON D7 D6 D5 D4 D3 D2 D1 D0
Bit symbol SMOD - - - GF1 GF0 PD IDL
In CHMOS type microcontrollers, except for the SMOD bit, all other bits are dummy. SMOD is the serial port baud rate multiplication bit. When SMOD = 1, the serial port baud rate is doubled. The system reset defaults to SMOD = 0.
Your definition:
SMOD: This bit is related to serial port communication.
SMOD=0; When serial port mode is 1, 2, 3, the baud rate is normal.
SMOD=1; When serial port mode is 1, 2, or 3, the baud rate is doubled.
GF1, GF0: Two general working flags, users can use them freely.
PD: Power-down mode setting bit.
PD=0 The microcontroller is in normal working state.
PD=1 The microcontroller enters the power down mode and can be awakened by an external interrupt or hardware reset mode. After entering the power down mode, the external crystal oscillator stops oscillating, the CPU, timer, and serial port all stop working, and only the external interrupt works.
IDL: Idle mode setting bit.
IDL=0 The microcontroller is in normal working state.
IDL=1 The MCU enters the idle mode. Except for the CPU, all other parts continue to work. In the idle mode, it can be awakened by any interrupt or hardware reset.
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