Power Control Register (Pcon) - Philips P89LPC902 User Manual

Philips Semiconductors
POWER MONITORING FUNCTIONS
PCON
Address: 87h
Not bit addressable
Reset Source(s): Any reset
Reset Value: 00000000B
BIT SYMBOL
PCON.7 SMOD1
PCON.6 SMOD0
PCON.5 BOPD
PCON.4 BOI
PCON.3 GF1
PCON.2 GF0
PCON.1-0 PMOD1-PMOD0
2003 Dec 8
7 6
SMOD1 SMOD0 BOPD
FUNCTION
Double Baud Rate bit for the serial port (UART) when Timer 1 is used as the baud rate
source. When 1, the Timer 1 overflow rate is supplied to the UART. When 0, the Timer 1
overflow rate is divided by 2 before being supplied to the UART. (See Figure 8-2).
Framing Error Location:
-When 0, bit 7 of SCON is accessed as SM0 for the UART.
-When 1, bit 7 of SCON is accessed as the framing error status (FE) for the UART.
This bit also determines the location of the UART receiver interrupt RI (see description
on RI in Figure 8-3).
Brownout Detect Power down. When 1, Brownout Detect is powered down and therefore
disabled. When 0, Brownout Detect is enabled. (Note: BOPD must be '0' before any
programming or erasing commands can be issued. Otherwise these commands will be
aborted.)
Brownout Detect Interrupt Enable. When 1, Brownout Detection will generate a interrupt .
When 0, Brownout Detection will cause a reset.
General Purpose Flag 1. May be read or written by user software, but has no effect on
operation.
General Purpose Flag 0. May be read or written by user software, but has no effect on
operation.
Power Reduction Mode (see section "Power Reduction Modes").
Figure 7-1: Power Control Register (PCON)
5 4 3
BOI GF1
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User's Manual - Preliminary -
P89LPC901/902/903
2 1 0
GF0 PMOD1 PMOD0