Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller
8K/256 OTP, 8 channel 10 bit A/D, I
2
C, PWM,
capture/compare, high I/O, low voltage (2.7V–5.5V), low power
P87C552
Table 1.
SYMBOL
87C552 Special Function Registers
DESCRIPTION
DIRECT
ADDRESS
BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION
MSB
LSB
RESET
VALUE
ACC*
ADCH#
ADCON#
AUXR
AUXR1
B*
CTCON#
CTH3#
CTH2#
CTH1#
CTH0#
CMH2#
CMH1#
CMH0#
CTL3#
CTL2#
CTL1#
CTL0#
CML2#
CML1#
CML0#
DPTR:
DPH
DPL
Accumulator
A/D converter high
A/D control
Auxillary
Auxillary
B register
Capture control
Capture high 3
Capture high 2
Capture high 1
Capture high 0
Compare high 2
Compare high 1
Compare high 0
Capture low 3
Capture low 2
Capture low 1
Capture low 0
Compare low 2
Compare low 1
Compare low 0
Data pointer
(2 bytes):
Data pointer high
Data pointer low
E0H
C6H
C5H
8EH
A2H
F0H
EBH
CFH
CEH
CDH
CCH
CBH
CAH
C9H
AFH
AEH
ADH
ACH
ABH
AAH
A9H
E7
E6
E5
E4
E3
E2
E1
E0
00H
xxxxxxxxB
ADC.1
–
ADC8
F7
CTN3
ADC.0
–
AIDL
F6
CTP3
ADEX
–
SRST
F5
CTN2
ADCI
–
GF2
F4
CTP2
ADCS
–
WUPD
F3
CTN1
AADR2
LVADC
O
F2
CTP1
AADR1
–
–
F1
CTN0
AADR0
A0
DPS
F0
CTP0
xx000000B
xxxxx110B
000000x0B
00H
00H
xxxxxxxxB
xxxxxxxxB
xxxxxxxxB
xxxxxxxxB
00H
00H
00H
xxxxxxxxB
xxxxxxxxB
xxxxxxxxB
xxxxxxxxB
00H
00H
00H
83H
82H
AF
AE
EAD
EE
ECM2
BE
PAD
FE
PADH
PCM2
PCM2H
ADC6
C6
CMT0
B6
WR
A6
A14
96
SCL
86
AD6
AD
ES1
ED
ECM1
BD
PS1
FD
PS1H
PCM1
PCM1H
ADC5
C5
CMSR5
B5
T1
A5
A13
95
RT2
85
AD5
AC
ES0
EC
ECM0
BC
PS0
FC
PS0H
PCM0
PCM0H
ADC4
C4
CMSR4
B4
T0
A4
A12
94
T2
84
AD4
AB
ET1
EB
ECT3
BB
PT1
FB
PT1H
PCT3
PCT3H
ADC3
C3
CMSR3
B3
INT1
A3
A11
93
CT3I
83
AD3
AA
EX1
EA
ECT2
BA
PX1
FA
PX1H
PCT2
PCT2H
ADC2
C2
CMSR2
B2
INT0
A2
A10
92
CT2I
82
AD2
A9
ET0
E9
ECT1
B9
PT0
F9
PT0H
PCT1
PCT1H
ADC1
C1
CMSR1
B1
TXD
A1
A9
91
CT1I
81
AD1
A8
EX0
E8
ECT0
B8
PX0
F8
PX0H
PCT0
PCT0H
ADC0
C0
CMSR0
B0
RXD
A0
A8
90
CT0I
80
AD0
00H
00H
IEN0*#
Interrupt enable 0
A8H
EA
EF
00H
IEN1*#
Interrupt enable 1
E8H
ET2
BF
00H
IP0*#
Interrupt priority 0
B8H
–
FF
x0000000B
IP0H
IP1*#
IP1H
P5#
Interrupt priority 0 high
Interrupt priority1
Interrupt priority 1 high
Port 5
B7H
F8H
F7H
C4H
–
PT2
PT2H
ADC7
C7
x0000000B
00H
00H
xxxxxxxxB
P4#*
Port 4
C0H
CMT1
B7
FFH
P3*
Port 3
B0H
RD
A7
FFH
P2*
Port 2
A0H
A15
97
FFH
P1*
Port 1
90H
SDA
87
FFH
P0*
Port 0
80H
AD7
FFH
1999 Mar 30
7
PHILIPS [ NXP SEMICONDUCTORS ]
