PCON Register in 8051

The power control register is an 8-bit register and its address is 0X87.  it can be Byte Addressable. the power control register is used to control 8051 power modes.

IDL, idle mode bit -

If IDL bit is set then it will activate idle mode of 8051 to save power.

PD, power down bit -

If PD bit is set when it will power down 8051.

GF0 and GF1 -

These are the general purpose flag bits.(i.e. bit0 and bit1)

SMOD, serial mode bit -

This bit is used to determine the serial communication port baud rate with timer 1.

Baudrate = Oscillator frequency in Hz / N[256-TH1].

The value of N, in above equation, is determined based of SMOD. 

If SMOD = 0 then N = 384.

If SMOD = 1 then N = 192.

Double baud rate bit. If Timer 1 is used to generate baud rate and SMOD = 1, the baud rate is doubled when the serial port is used in modes 1, 2, or 3.

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