Preliminary W78E378/W78C378/W78C374
FUNCTIONAL DESCRIPTION
Address Space
7FFFh
(3FFFh)
Internal
Program Memory
FFh
FFh
Internal RAM
256 Bytes
8051SFRs &
Serial Ports SFRs
On-Chip Data Memory
64 Bytes
External Access
"MOVX @Ri"
new SFRs
C0h
BFh
Indirect Addressing Direct Addressing
"MOV"
"MOV @Ri"
External Access
External Access
"MOVX @Ri"
"MOVX @Ri"
80h
7Fh
80h
7Fh
7Fh
00h
On-Chip Data Memory
128 Bytes
On-Chip Data Memory
128 Bytes
Direct or Indirect
Addressing
"MOV" or "MOV @Ri"
External Access
"MOVX @Ri"
External Access
"MOVX @Ri"
0000h
00h
00h
BANK0
BANK1
Program/Data/SFRs Address Space
SFRs accessed using 'Direct Addressing'
REGISTER
ADDRESS
BITS
POWER
RESET
R/W
ON RESET
1
2
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
x0h
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
A*
B*
E0h
F0h
D0h
81h
82h
83h
A8h
B8h
88h
89h
8Ah
8Ch
8Bh
8Dh
87h
3
PSW*
SP
4
DPL
DPH
IE*
5
6
7
8
IP*
9
TCON*
TMOD
TL0
10
11
12
13
14
15
TH0
TL1
TH1
PCON
Publication Release Date: December 1999
Revision A1
- 7 -
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