W79E225A Datasheet, PDF (21/200 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E225A/227A Data Sheet
7. SPECIAL FUNCTION REGISTERS
The W79E225/227 uses Special Function Registers (SFR) to control and monitor peripherals. The
SFR reside in register locations 80-FFh and are only accessed by direct addressing. The
W79E225/227 contains all the SFR present in the standard 8051/52, as well as some additional SFR,
and, in some cases, unused bits in the standard 8051/52 have new functions. SFR whose addresses
end in 0 or 8 (hex) are bit-addressable. The following table of SFR is condensed, with eight locations
per row. Empty locations indicate that there are no registers at these addresses.
F8
EIP
EIE1
EIP1
CCL0
/PCNTL
CCH0
/PCNTH
CCL1
CCH1
/PLSCNTL /PLSCNTH
INTCTRL
F0
B
SPCR
SPSR
SPDR
I2CSADEN
EIPH
E8
EIE
I2CON
I2ADDR NVMADDRH I2DAT
I2STATUS
I2CLK
I2TIMER
E0
ACC
ADCCON
ADCH
ADCL
PDTC1
PDTC0
PWMCON4
D8
WDCON
PWMPL
PWM0L NVMADDRL PWMCON1 PWM2L
PWM6L PWMCON3
D0
PSW
PWMPH PWM0H NVMDAT QEICON
PWM2H
PWM6H
WDCON2
C8
T2CON
T2MOD RCAP2L RCAP2H
TL2
TH2
PWMCON2 PWM4L
C0
SCON1
SBUF1
T3MOD
T3CON
PMR
FSPLT
ADCPS
TA
B8
IP
SADEN SADEN1
POVM
POVD
PIO
PWMEN
PWM4H
B0
P3
P5
RCAP3L
RCAP3H
EIP1H
IPH
A8
IE
SADDR SADDR1
SFRAL
SFRAH
SFRFD
SFRCN
CCL2
CCH2
A0
P2
XRAMAH P4CSIN CAPCON0 CAPCON1
P4
/MAXCNTL /MAXCNTH
98
SCON
SBUF
P42AL
P42AH
P43AL
P43AH
NVMCON CHPCON
90
P1
EXIF
P4CONA P4CONB
P40AL
P40AH
P41AL
P41AH
88
TCON
TMOD
TL0
TL1
TH0
TH1
CKCON
CKCON1
80
P0
SP
DPL
DPH
TL3
TH3
PCON
Table 7-1: Special Function Register Location Table
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Publication Release Date: December 14, 2007
Revision A2.0