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P89LPC92X1 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 2.1 — 27 August 2012 24 of 75
NXP Semiconductors
P89LPC9201/9211/922A1/9241/9251
8-bit microcontroller with 8-bit ADC
[1] All ports are in input only (high-impedance) state after power-up.
[2] BRGR1 and BRGR0 must only be written if BRGEN in BRGCON SFR is logic 0. If any are written while BRGEN = 1, the result is unpredictable.
[3] The RSTSRC register reflects the cause of the P89LPC9241/9251 reset except BOIF bit. Upon a power-up reset, all reset source flags are cleared except POF and BOF; the
power-on reset value is x011 0000.
[4] After reset, the value is 1110 01x1, i.e., PRE2 to PRE0 are all logic 1, WDRUN = 1 and WDCLK = 1. WDTOF bit is logic 1 after watchdog reset and is logic 0 after power-on reset.
Other resets will not affect WDTOF.
[5] On power-on reset and watchdog reset, the TRIM SFR is initialized with a factory preprogrammed value. Other resets will not cause initialization of the TRIM register.
[6] The only reset sources that affect these SFRs are power-on reset and watchdog reset.
CLKCON register reset value comes from UCFG1 and UCFG2. The reset value of CLKCON.2 to CLKCON.0 come from UCFG1.2 to UCFG1.0 and reset value of CLKDBL bit
comes from UCFG2.7
SP Stack pointer 81H 07 0000 0111
TAMOD Timer 0 and 1
auxiliary mode
8FH - - - T1M2 - - - T0M2 00 xxx0 xxx0
Bit address 8F 8E 8D 8C 8B 8A 89 88
TCON* Timer 0 and 1
control
88H TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 00 0000 0000
TH0 Timer 0 high 8CH 00 0000 0000
TH1 Timer 1 high 8DH 00 0000 0000
TL0 Timer 0 low 8AH 00 0000 0000
TL1 Timer 1 low 8BH 00 0000 0000
TMOD Timer 0 and 1
mode
89H T1GATE T1C/T T1M1 T1M0 T0GATE T0C/T T0M1 T0M0 00 0000 0000
TRIM Internal
oscillator trim
register
96H RCCLK ENCLK TRIM.5 TRIM.4 TRIM.3 TRIM.2 TRIM.1 TRIM.0
[5][6]
WDCON Watchdog
control register
A7H PRE2 PRE1 PRE0 - - WDRUN WDTOF WDCLK
[4][6]
WDL Watchdog load C1H FF 1111 1111
WFEED1 Watchdog
feed 1
C2H
WFEED2 Watchdog
feed 2
C3H
Table 6. Special function registers - P89LPC9241/9251
…continued
* indicates SFRs that are bit addressable.
Name Description SFR
addr.
Bit functions and addresses Reset value
MSB LSB Hex Binary
