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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.
Special Function Registers Table - P89LPC901
Name
Description
ACC*
Accumulator
AUXR1#
Auxiliary Function Register
B*
B Register
CMP1#
Comparator 1 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
IEN0*
Interrupt Enable 0
IEN1*#
Interrupt Enable 1
IP0*
Interrupt Priority 0
2003 Dec 8
SFR
Address
MSB
E7
E6
E0H
A2H
CLKLP
-
F7
F6
F0H
ACH
-
-
95H
83H
82H
E7H
E6H
BUSY
-
E4H
FMCMD.
FMCMD.
FMCMD.
7
6
E5H
AF
AE
A8H
EA
EWDRT
EBO
EF
EE
E8H
-
-
BF
BE
B8H
-
PWDRT
PBO
16
Bit Functions and Addresses
E5
E4
E3
E2
-
ENT0
SRST
0
F5
F4
F3
F2
CE1
-
CN1
-
-
-
HVA
HVE
FMCMD.
FMCMD.
FMCMD.
5
4
3
2
AD
AC
AB
AA
-
ET1
-
ED
EC
EB
EA
-
-
-
EC
BD
BC
BB
BA
-
PT1
-
User's Manual - Preliminary -
P89LPC901/902/903
Reset Value
LSB
Hex
Binary
E1
E0
00H
00000000
1
-
DPS
00H
000000x0
F1
F0
00H
00000000
1
CO1
CMF1
00H
xx000000
00H
00000000
00H
00000000
00H
00000000
00H
00000000
00H
00000000
SV
OI
70H
01110000
FMCMD.
FMCMD.
1
0
00H
00000000
A9
A8
ET0
-
00H
00000000
E9
E8
1
EKBI
-
00H
00x00000
B9
B8
1
PT0
-
00H
x0000000
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