80C851 Datasheet, PDF (6/22 Pages) NXP Semiconductors – CMOS single-chip 8-bit microcontroller with on-chip EEPROM

Philips Semiconductors
CMOS single-chip 8-bit microcontroller
with on-chip EEPROM
Product specification
80C851/83C851
Table 1. 8XC851 Special Function Registers
SYMBOL DESCRIPTION
ACC*
Accumulator
DIRECT
BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION
RESET
ADDRESS MSB
LSB VALUE
E0H
E7
E6
E5
E4
E3
E2
E1
E0 00H
B*
B register
F0H
F7
F6
F5
F4
F3
F2
F1
F0 00H
EF
EE
ED
EC
EB
EA
E9
E8
DPTR:
Data pointer
(2 bytes):
DPH
High byte
83H
00H
DPL
Low byte
82H
00H
EADRH# EEPROM addr
F3H
80H
reg-high
EADRL# EEPROM addr
F2H
00H
reg-low
ECNTRL# EEPROM control reg
F6H
EDAT#
EEPROM data
F4H
register
IFE EEINT EWP
–
ECNTR ECNTR ECNTR ECNTR 00H
L3
L2
L1
L0
xxH
ETIM#
EEPROM timer
F5H
08H
register
BF
BE
BD
BC
BB
BA
B9
B8
IP*
Interrupt priority
B8H
–
–
–
PS
PT1
PX1
PT0
PX0 xxx00000B
IE*
P0*
P1*
P2*
P3*
PCON
Interrupt enable
Port 0
Port 1
Port 2
Port 3
Power control
AF
AE
AD
A8H
EA
–
–
80H
87
86
85
90H
97
96
95
A0H
A7
A6
A5
B0H
B7
B6
B5
87H SMOD –
–
AC
AB
AA
A9
A8
ES
ET1
EX1
ET0
EX0 0xx00000B
84
83
82
81
80 FFH
94
93
92
91
90 FFH
A4
A3
A2
A1
A0 FFH
B4
B3
B2
B1
B0 FFH
–
GF1
GF0
PD
IDL 0xxx0000B
D7
D6
D5
D4
D3
D2
D1
D0
PSW*
Program status word
D0H
CY
AC
F0
RS1
RS0
OV
–
P 00H
SBUF
Serial data buffer
99H
xxxxxxxxB
9F
9E
9D
9C
9B
9A
99
98
SCON*
Serial port control
98H
SM0 SM1 SM2
REN
TB8
RB8
TI
RI 00H
SP
Stack pointer
81H
07H
8F
8E
8D
8C
8B
8A
89
88 00H
TCON*
Timer/counter con-
trol
88H
TF1 TR1 TF0
TR0
IE1
IT1
IE0
IT0 00H
TMOD
Timer/counter mode
89H
GATE C/T
M1
M0
GATE
C/T
M1
M0 00H
TH0
Timer 0 high byte
8CH
00H
TH1
Timer 1 high byte
8DH
00H
TL0
Timer 0 low byte
8AH
00H
TL1
Timer 1 low byte
8BH
00H
* SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
1998 Jul 03
6