W78E054D Datasheet, PDF (18/89 Pages) List of Unclassifed Manufacturers – 8-bit microcontroller

W78E054D/W78E052D Data Sheet
9 SPECIAL FUNCTION REGISTERS
The W78E054D/W78E052D series 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 us-
ers wish 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 W78E054D/W78E052D series contain all the SFRs present
in the standard 8052. However some additional SFRs are added. In some cases the unused bits in the
original 8052, have been given new functions. The list of the SFRs is as follows.
F8
FF
F0 B
F7
E8
EF
E0 ACC
E7
D8 P4
DF
D0 PSW
D7
C8 T2CON T2MOD RCAP2L RCAP2H TL2
TH2
CF
C0 XICON
SFRAL SFRAH SFRRD SFRCN C7
B8 IP
EAPAGE CHPCON BF
B0 P3
IPH
B7
A8 IE
AF
A0 P2
A7
98 SCON SBUF
9F
90 P1
97
88 TCON TMOD TL0
TL1
TH0
TH1
AUXR WDTC
8F
80 P0
SP
DPL
DPH
P0UPR PCON
87
Table 9–1: Special Function Register Location Table
Note:
1. The SFRs in the column with dark borders are bit-addressable
2. The table is condensed with eight locations per row. Empty locations indicate that these are no reg-
isters at these addresses. When a bit or register is not implemented, it will read high.
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Publication Release Date: Jun 9, 2015
Revision A13