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© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
User manual Rev. 02 — 23 May 2005 35 of 133
Philips Semiconductors
UM10109
P89LPC932A1 User manual
Table 13: Power Control register (PCON - address 87h) bit allocation
Bit 7 6 5 4 3 2 1 0
Symbol SMOD1 SMOD0 BOPD BOI GF1 GF0 PMOD1 PMOD0
Reset00000000
Table 14: Power Control register (PCON - address 87h) bit description
Bit Symbol Description
0 PMOD0 Power Reduction Mode (see Section 5.3
)
1PMOD1
2 GF0 General Purpose Flag 0. May be read or written by user software, but has no effect
on operation
3 GF1 General Purpose Flag 1. May be read or written by user software, but has no effect
on operation
4 BOI Brownout Detect Interrupt Enable. When logic 1, Brownout Detection will generate a
interrupt. When logic 0, Brownout Detection will cause a reset
5 BOPD Brownout Detect power-down. When logic 1, Brownout Detect is powered down and
therefore disabled. When logic 0, Brownout Detect is enabled. (Note: BOPD must
be logic 0 before any programming or erasing commands can be issued. Otherwise
these commands will be aborted.)
6 SMOD0 Framing Error Location:
• When logic 0, bit 7 of SCON is accessed as SM0 for the UART.
• When logic 1, bit 7 of SCON is accessed as the framing error status (FE) for the
UART
7 SMOD1 Double Baud Rate bit for the serial port (UART) when Timer 1 is used as the baud
rate source. When logic 1, the Timer 1 overflow rate is supplied to the UART. When
logic 0, the Timer 1 overflow rate is divided by two before being supplied to the
UART. (See Section 10
)
Table 15: Power Control register A (PCONA - address B5h) bit allocation
Bit 7 6 5 4 3 2 1 0
Symbol RTCPD DEEPD VCPD - I2PD SPPD SPD CCUPD
Reset00000000
Table 16: Power Control register A (PCONA - address B5h) bit description
Bit Symbol Description
0 CCUPD Compare/Capture Unit (CCU) power-down: When logic 1, the internal clock to the
CCU is disabled. Note that in either Power-down mode or Total Power-down mode,
the CCU clock will be disabled regardless of this bit. (Note: This bit is overridden by
the CCUDIS bit in FCFG1. If CCUDIS = 1, CCU is powered down.)
1 SPD Serial Port (UART) power-down: When logic 1, the internal clock to the UART is
disabled. Note that in either Power-down mode or Total Power-down mode, the
UART clock will be disabled regardless of this bit.
2 SPPD SPI power-down: When logic 1, the internal clock to the SPI is disabled. Note that in
either Power-down mode or Total Power-down mode, the SPI clock will be disabled
regardless of this bit.
3I2PDI
2
C power-down: When logic 1, the internal clock to the I
2
C-bus is disabled. Note
that in either Power-down mode or Total Power-down mode, the I
2
C clock will be
disabled regardless of this bit.