Special Function Registers - Philips P89LPC920 User Manual

Philips Semiconductors
General Description

Special Function Registers

Note: Special Function Registers (SFRs) accesses are restricted in the following ways:
1. User must NOT attempt to access any SFR locations not defined.
2. Accesses to any defined SFR locations must be strictly for the functions for the SFRs.
3. SFR bits labeled '-', '0' or '1' can ONLY be written and read as follows:
- '-' Unless otherwise specified, MUST be written with '0', but can return any value when read (even if it was written with '0').
It is a reserved bit and may be used in future derivatives.
- '0' MUST be written with '0', and will return a '0' when read.
- '1' MUST be written with '1', and will return a '1' when read
Name Description
ACC* Accumulator
AUXR1# Auxiliary Function Register
B* B Register
BRGR0#§ Baud Rate Generator Rate Low
BRGR1#§ Baud Rate Generator Rate High
BRGCON# Baud Rate Generator Control
CMP1# Comparator 1 Control Register
CMP2# Comparator 2 Control Register
DIVM# CPU Clock Divide-by-M Control
DPTR Data Pointer (2 bytes)
DPH Data Pointer High
DPL Data Pointer Low
FMADRH# Program Flash Address High
FMADRL# Program Flash Address Low
Program Flash Control (Read)
FMCON#
Program Flash Control (Write)
FMDATA# Program Flash Data
2
I2ADR# I C Slave Address Register
2
I2CON*# I C Control Register
2
I2DAT# I C Data Register
Serial Clock Generator/SCL Duty
I2SCLH#
Cycle Register High
2003 Dec 8
SFR
Address
MSB
E7 E6
E0H
A2H CLKLP EBRR ENT1
F7 F6
F0H
BEH
BFH
BDH - -
ACH - -
ADH - -
95H
83H
82H
E7H
E6H
BUSY -
E4H
FMCMD. FMCMD. FMCMD.
7 6
E5H
DBH I2ADR.6 I2ADR.5 I2ADR.4 I2ADR.3 I2ADR.2 I2ADR.1 I2ADR.0
DF DE
D8H - I2EN
DAH
DDH
14
Bit Functions and Addresses
E5 E4 E3 E2
ENT0 SRST 0
F5 F4 F3 F2
- - - -
CE1 CP1 CN1 OE1
CE2 CP2 CN2 OE2
- - HVA HVE
FMCMD. FMCMD. FMCMD.
5 4 3 2
DD DC DB DA
STA STO SI AA
User's Manual - Preliminary -
P89LPC920/921/922
Reset Value
LSB
Hex Binary
E1 E0
00H 00000000
1
- DPS 00H 000000x0
F1 F0
00H 00000000
00H 00000000
00H 00000000
%
SBRGS BRGEN 00H xxxxxx00
1
CO1 CMF1 00H xx000000
1
CO2 CMF2 00H xx000000
00H 00000000
00H 00000000
00H 00000000
00H 00000000
00H 00000000
SV OI 70H 01110000
FMCMD. FMCMD.
1 0
00H 00000000
GC 00H 00000000
D9 D8
- CRSEL 00H x00000x0
00H 00000000