VRS51C1000
Special Function Registers (SFR)
Addresses 80h to FFh of the SFR address space can be accessed in direct addressing mode only. The following table
lists the VRS51C1000 Special Function Registers.
TABLE 5: SPECIAL FUNCTION REGISTERS (SFR)
SFR
Register
SFR
Adrs
80h
81h
82h
83h
85h
86h
87h
88h
89h
8Ah
8Bh
8Ch
8Dh
90h
98h
99h
9Bh
9Fh
A0h
A3h
A4h
A5h
A6h
A7h
A8h
ACh
B0h
B8h
BFh
C8h
CAh
CBh
CCh
CDh
D0h
D8h
E0h
F0h
F4h
F5h
F6h
F7h
Reset
Value
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
1111 1111b
0000 0111b
0000 0000b
0000 0000b
0000 0000b
0000 0001b
0000 0000b
0000 0010b
0000 0000b
0000 0000b
0000 0000b
0000 0000b
0000 0000b
1111 1111b
0000 0000b
0111 1111b
0000 0000b
0000 0000b
1111 1111b
0000 0000b
0000 0000b
0000 0000b
0000 0000b
0000 0000b
0000 0000b
0000 0000b
1111 1011b
0000 0000b
0000 1010b
0000 0000b
0000 0000b
0000 0000b
0000 0000b
0000 0000b
0000 0001b
****1111b
P0
SP
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
DPL
DPH
RCON
DBANK
PCON
TCON
TMOD
TL0
TL1
TH0
TH1
-
-
-
RAMS1
BS1
PDOWN
IE0
M1.0
-
-
-
RAMS0
BS0
IDLE
IT0
M0.0
-
-
-
-
-
RI
-
-
BSE
SMOD
TF1
GATE1
BS3
GF1
IE1
GATE0
BS2
GF0
IT1
C/T0
-
-
-
-
TR1
C/T1
-
-
-
-
-
SM1
-
PWM3E
TF0
M1.1
-
-
-
-
-
SM2
-
PWM2E
CLEAR
TR0
M0.1
-
-
-
-
-
REN
-
PWM1E
-
-
-
-
-
-
-
-
-
-
TI
-
-
P1
-
-
-
SCON
SBUF
PWME
WDTC
P2
PWMC
PWMD0
PWMD1
PWMD2
PWMD3
IE
SM0
-
PWM4E
WDTE
TB8
-
PWM0E
RB8
-
-
PS2
-
-
-
-
-
-
-
-
-
-
PS1
-
PS0
-
-
-
-
-
-
PDCK1
NP0.1
NP1.1
NP2.1
NP3.1
ET0
NP4.1
-
PT0
XRAME
C/T2
-
PDCK0
NP0.0
NP1.0
NP2.0
NP3.0
EX0
NP4.0
-
PX0
ALEI
CP/RL2
-
PWMD0.4
PWMD1.4
PWMD2.4
PWMD3.4
EA
PWMD4.4
PWMD0.3
PWMD1.3
PWMD2.3
PWMD3.3
PWMD0.2
PWMD1.2
PWMD2.2
PWMD3.2
ET2
PWMD4.2
PWMD0.1
PWMD1.1
PWMD2.1
PWMD3.1
ES
PWMD4.1
PWMD0.0
PWMD1.0
PWMD2.0
PWMD3.0
ET1
PWMD4.0
NP0.2
NP1.2
NP2.2
NP3.2
EX1
NP4.2
-
PX1
IAPE
TR2
-
-
PWMD4
P3
PWMD4.3
-
-
-
-
-
-
-
-
IP
PT2
-
RCLK
-
-
-
PS
-
TCLK
-
-
-
PT1
-
EXEN2
SYSCON
T2CON
RCAP2L
RCAP2H
TL2
WDR
TF2
-
-
-
EXF2
-
-
-
-
-
-
-
-
-
-
-
-
TH2
PSW
CY
-
-
-
FA15
FA7
FD7
AC
-
-
F0
-
-
RS1
-
-
RS0
P4.3
-
OV
P4.2
-
-
P4.1
-
P
P4.0
-
P4
ACC
0000 0000b
0000 0000b
0000 0000b
0000 0000b
0000 0000b
B
-
-
-
-
-
-
-
IAPFADHI
IAPFADLO
IAPFDATA
IAPFCTRL
FA14
FA6
FD6
FA13
FA5
FD5
FA12
FA4
FD4
FA11
FA3
FD3
FA10
FA2
FD2
FA9
FA1
FD1
IAPFCT1
FA8
FA0
FD0
IAPFCT0
IAPSTART
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