W79E648 Datasheet, PDF (10/80 Pages) Winbond – Fast 8051 Compatible microcontroller with a redesigned Processor

Preliminary W79E648
Special Function Registers
The W79E648 uses Special Function Registers (SFRs) to control and monitor peripherals and their
Modes.
The SFRs reside in the register locations 80-FFh and are accessed by direct addressing only. Some
of the SFRs are bit addressable. This is very useful in cases where one wishes to modify a particular
bit without changing the others. The SFRs that are bit addressable are those whose addresses end in
0 or 8. The W79E648 contains all the SFRs present in the standard 8052. However, some additional
SFRs have been added. In some cases unused bits in the original 8052 have been given new
functions. The list of SFRs is as follows. The table is condensed with eight locations per row. Empty
locations indicate that there are no registers at these addresses. When a bit or register is not
implemented, it will read high.
Table 1. Special Function Register Location Table
F8 EIP
F0 B
E8 EIE
E0 ACC
D8 WDCON
D0 PSW
C8 T2CON
C0
B8 IP
B0 P3
A8 IE
A0 P2
98 SCON0
90 P1
88 TCON
80 P0
PWMP
PWM0
PWM1
PWMCON1 PWM2
T2MOD
SADEN
P5
SADDR
XRAMAH
SBUF
TMOD
SP
RCAP2L
P6
P4CSIN
P42AL
P4CONA
TL0
DPL
RCAP2H
PWM5
TL2
PMR
P7
ROMCON SFRAL
P42AH
P4CONB
TL1
DPH
P43AL
P40AL
TH0
TH2
STATUS
SFRAH
P4
P43AH
P40AH
TH1
Note: The SFRs in the column with dark borders are bit-addressable.
PWM3
PWMCON2 PWM4
TA
SFDFD
SFRCN
P41AL
CKCON
CHPCON
P41AH
PCON
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