
Philips Semiconductors
80C51 Family Derivatives
8XC552/562 overview
1996 Aug 06
4
Table 1.
8XC552 Special Function Registers
SYMBOL
DESCRIPTION
DIRECT
ADDRESS
BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION
MSB
LSB
RESET
VALUE
ACC*
Accumulator
E0H
E7
E6
E5
E4
E3
E2
E1
E0
00H
ADCH#
A/D converter high
C6H
xxxxxxxxB
ADCON#
Adc control
C5H
ADC.1
ADC.0
ADEX
ADCI
ADCS
AADR2
AADR1
AADR0
xx000000B
B*
B register
F0H
F7
F6
F5
F4
F3
F2
F1
F0
00H
CTCON#
Capture control
EBH
CTN3
CTP3
CTN2
CTP2
CTN1
CTP1
CTN0
CTP0
00H
CTH3#
CTH2#
CTH1#
CTH0#
CMH2#
CMH1#
CMH0#
CTL3#
CTL2#
CTL1#
CTL0#
CML2#
CML1#
CML0#
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
CFH
CEH
CDH
CCH
CBH
CAH
C9H
AFH
AEH
ADH
ACH
ABH
AAH
A9H
xxxxxxxxB
xxxxxxxxB
xxxxxxxxB
xxxxxxxxB
00H
00H
00H
xxxxxxxxB
xxxxxxxxB
xxxxxxxxB
xxxxxxxxB
00H
00H
00H
DPTR:
DPH
DPL
Data pointer
(2 bytes)
Data pointer high
Data pointer low
83H
82H
00H
00H
AF
AE
AD
AC
AB
AA
A9
A8
IEN0*#
Interrupt enable 0
A8H
EA
EAD
ES1
ES0
ET1
EX1
ET0
EX0
00H
EF
EE
ED
EC
EB
EA
E9
E8
IEN1*#
Interrupt enable 1
E8H
ET2
ECM2
ECM1
ECM0
ECT3
ECT2
ECT1
ECT0
00H
BF
BE
BD
BC
BB
BA
B9
B8
IP0*#
Interrupt priority 0
B8H
–
PAD
PS1
PS0
PT1
PX1
PT0
PX0
x0000000B
FF
FE
FD
FC
FB
FA
F9
F8
IP1*#
Interrupt priority 1
F8H
PT2
PCM2
PCM1
PCM0
PCT3
PCT2
PCT1
PCT0
00H
P5#
Port 5
C4H
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADC1
ADC0
xxxxxxxxB
C7
C6
C5
C4
C3
C2
C1
C0
P4#
Port 4
C0H
CMT1
CMT0
CMSR5
CMSR4
CMSR3
CMSR2
CMSR1
CMSR0
FFH
B7
B6
B5
B4
B3
B2
B1
B0
P3*
Port 3
B0H
RD
WR
T1
T0
INT1
INT0
TXD
RXD
FFH
A7
A6
A5
A4
A3
A2
A1
A0
P2*
Port 2
A0H
A15
A14
A13
A12
A11
A10
A9
A8
FFH
97
96
95
94
93
92
91
90
P1*
Port 1
90H
SDA
SCL
RT2
T2
CT3I
CT2I
CT1I
CT0I
FFH
87
86
85
84
83
82
81
80
P0*
Port 0
80H
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
FFH
PCON#
Power control
87H
SMOD
–
–
WLE
GF1
GF0
PD
IDL
00xx0000B
D7
D6
D5
D4
D3
D2
D1
D0
PSW*
SFRs are bit addressable.
#
SFRs are modified from or added to the 80C51 SFRs.
Program status word
D0H
CY
AC
F0
RS1
RS0
OV
F1
P
00H
*