8051 PCON Register

Power Control Register

• Address: 0x87
• Size: 8 bit.
• Byte addressable.
• Used to control 8051 power modes.

Bit	Description
IDL	Writing 1 activate idle mode to save power
PD	Writing 1 will power down 8051
GF0	General purpose flag bit 0
GF1	General purpose flag bit 1
SMOD	Serial mode 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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Related topics:
8051 Registers   |   8051 Program Counter   |   8051 R Registers   |   8051 SFR   |   8051 P Registers   |   8051 Stack   |   8051 Stack Pointer   |   8051 Data Pointer   |   8051 TCON Register   |   8051 TMOD Register   |   8051 Timer Registers   |   8051 SCON Register   |   8051 SBUF Register   |   8051 IE Register   |   8051 IP Register   |   8051 PSW Register   |   8051 A Register   |   8051 B Register

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List of topics: 8051

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