83C751 Datasheet, PDF (11/24 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 2K/64 OTP/ROM, I2C, low pin count

Philips Semiconductors
80C51 8-bit microcontroller family
2K/64 OTP/ROM, I²C, low pin count
Product specification
83C751/87C751
Table 3. 8XC751 Special Function Registers
SYMBOL
DESCRIPTION
DIRECT
BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION
ADDRESS MSB
LSB
ACC*
Accumulator
E0H
E7
E6
E5
E4
E3
E2
E1
E0
B*
B register
F0H
F7
F6
F5
F4
F3
F2
F1
F0
DPTR: Data pointer
(2 bytes)
DPH
High byte
83H
DPL
Low byte
82H
I²CFG*# I²C configuration
DF
DE
DD
DC
DB
D8H/RD ^{SLAVEN MASTRQ}
0
TIRUN
–
DA
D9
D8
–
CT1
CT0
WR
SLAVEN MASTRQ _{CLRTI TIRUN}
–
–
CT1
CT0
RESET
VALUE
00H
00H
00H
00H
0000xx00B
I²CON*# I²C control
I²DAT# I²C data
I²STA*# I²C status
IE*#
Interrupt enable
P0*#
Port 0
P1*
Port 1
P3*
Port 3
98H/RD
WR
9F
RDAT
CXA
9E
ATN
IDLE
9D
DRDY
CDR
9C
ARL
CARL
9B
STR
CSTR
9A
STP
CSTP
99
MASTER
XSTR
98
– 81H
XSTP
99H/RD RDAT
0
0
0
0
0
0
0 80H
WR
XDAT X
X
X
X
X
X
X
F8H
FF
FE
FD
FC
FB
FA
F9
F8
–
IDLE XDATA XACTV ^{MAKSTR MAKSTP} XSTR XSTP x0100000B
ABH
AF
AE
AD
EA
–
–
AC
AB
AA
A9
A8
EI2
ET1
EX1
ET0
EX0 00H
82
81
80
80H
–
–
–
–
–
–
SDA SCL xxxxx111B
97
96
95
94
93
92
91
90
90H
T0 INT1 INT0
–
–
–
–
– FFH
B0H
B7
B6
B5
B4
B3
B2
B1
B0 FFH
PCON# Power control
87H
–
–
–
–
–
–
PD
IDL xxxxxx00B
D7
D6
D5
D4
D3
D2
D1
D0
PSW*
Program status word
D0H
CY
AC
F0
RS1
RS0
OV
–
P 00H
SP
Stack pointer
81H
07H
8F
8E
8D
8C
8B
8A
89
88
TCON*# Timer/counter control
88H
GATE C/T
TF
TR
IE0
IT0
IE1
IT1 00H
TL#
Timer low byte
8AH
00H
TH#
Timer high byte
8CH
00H
RTL#
Timer low reload
8BH
00H
RTH#
Timer high reload
8DH
00H
* SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
1998 May 01
11