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P89LPC915_916_917_5 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 05 — 15 December 2009 26 of 75
NXP Semiconductors
P89LPC915/916/917
8-bit microcontrollers with accelerated two-clock 80C51 core
[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 P89LPC915/916/917 reset. Upon a power-up reset, all reset source flags are cleared except POF and BOF; the power-on reset
value is xx11 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, the TRIM SFR is initialized with a factory preprogrammed value. Other resets will not cause initialization of the TRIM register.
[6] The only reset source that affects these SFRs is power-on reset.
SSTAT Serial port extended status
register
BAH DBMOD INTLO CIDIS DBISEL FE BR OE STINT 00 0000 0000
SP Stack pointer 81H 07 0000 0111
SPCTL SPI control register E2H SSIG SPEN DORD MSTR CPOL CPHA SPR1 SPR0 04 0000 0100
SPSTAT SPI status register E1H SPIF WCOL - - - - - - 00 00xx xxxx
SPDAT SPI data register E3H 00 0000 0000
TAMOD Timer 0 and 1 auxiliary mode 8FH - ------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 - - 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 - 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 8. P89LPC916 special function registers
…continued
* indicates SFRs that are bit addressable.
Name Description SFR
addr.
Bit functions and addresses Reset value
MSB LSB Hex Binary
