80C550 Datasheet, PDF (6/28 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, 8 channel 8 bit A/D, watchdog timer

Philips Semiconductors
80C51 8-bit microcontroller family
4K/128 OTP/ROM/ROMless, 8 channel 8 bit A/D, watchdog timer
Product specification
80C550/83C550/87C550
Table 1. 8XC550 Special Function Registers
SYMBOL DESCRIPTION
ACC*
Accumulator
DIRECT
BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION
ADDRESS MSB
LSB
E0H
E7
E6
E5
E4
E3
E2
E1
E0
RESET
VALUE
00H
ADAT#
A/D result
C6H
xxH
ADCON# A/D control
C5H
–
–
–
ADCI ADCS AADR2 AADR1 AADR0 xxx00000B
B*
B register
F0H
F7
F6
F5
F4
F3
F2
F1
F0 00H
DPTR:
Data pointer
(2 bytes):
DPH
High byte
83H
00H
DPL
Low byte
82H
00H
BF
BE
BD
BC
BB
BA
B9
B8
IP*#
Interrupt priority
B8H
–
PWD PAD
PS
PT1
PX1
PT0
PX0 x0000000B
IE*#
P0*
P1*
P2*
P3*
PCON#
Interrupt enable
Port 0
Port 1
Port 2
Port 3
Power control
AF
AE
AD
AC
AB
AA
A9
A8
A8H
EA EWD EAD
ES
ET1
EX1
ET0
EX0 00H
80H
87
86
85
84
83
82
81
80 FFH
90H
97
96
95
94
93
92
91
90 FFH
A0H
A7
A6
A5
A4
A3
A2
A1
A0 FFH
B0H
B7
B6
B5
B4
B3
B2
B1
B 0 FFH
87H SMOD SIDL
–
–
GF1 GF0
PD
IDL 00xx0000B
PSW*
SBUF
Program status word
Serial data buffer
D0H
99H
SCON*
Serial port control
98H
SP
Stack pointer
81H
TCON*
Timer counter/control
88H
D7
D6
D5
D4
D3
D2
D1
CY
AC
F0
RS1 RS0
OV
–
9F
9E
9D
9C
9B
9A
99
SM0 SM1 SM2
REN
TB8
RB8
TI
8F
8E
8D
8C
8B
8A
89
TF1 TR1 TF0
TR0
IE1
IT1
IE0
D0
P 00H
xxH
98
RI 00H
07H
88 00H
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
C7
C6
C5
C4
C3
C2
C1
C0
WDCON*# Watchdog timer
control
C0H
PRE2 PRE1 PRE0
–
–
WDRUN WDTOF WDMOD 000xx000B**
WDL#
Watchdog timer
reload
C1H
FFH**
WFEED1# Watchdog timer
C2H
xxH
feed 1
WFEED2# Watchdog timer
C3H
xxH
feed 2
* SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
**This value is not valid for a masked ROM part (83C550) when running from internal memory (EA = 1). See data sheet for details.
1998 May 01
6