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參數資料
| 型號： | W78C438B |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 8-BIT Microcontroller(8位的微控制器) |
| 中文描述： | 8位微控制器（8位的微控制器） |
| 文件頁數： | 7/16頁 |
| 文件大小： | 221K |
| 代理商： | W78C438B |
W78C438B
Publication Release Date: April 1997
- 7 -
Revision A4
(A) EPMA.7 = 0
W78C438
EPROM
RAM
AP5
PSEN
ADDR 1MB
(20-bit)
ADDR(20-bit)
DATA
AP6
DP4
WR
RD
P3
OE
WE
OE
AP7
P1
P0
P2
P8
INT1
INT2
INT3
INT0
\ 8
\ 8
\ 4
\ 8
64K PROGRAM
DATA AREA
When bit 7 of the EPMA is "1," AP7<3:0> are the output pins that support memory-mapped peripheral
chip select logic, which eliminates the need for glue logic. These pins are decoded by AP6<7:6>.
Only one pin is active low at any time. That is, they are active individually with 16K address
resolution. For example, CS0 is active low in the address range from 0000H to 3FFFH, CS1 is active
low in the address range from 4000H to 7FFFH, and so forth.
(B) EPMA.7 = 1
W78C438
AP5
AP6
PSEN
DP4
WR
RD
P3
P1
P0
P2
P8
INT1
INT2
INT3
INT0
RAM
ADDR(14-bit)
DATA
WE
OE
AP7.0
AP7.1
AP7.2
AP7.3
0000h
3FFFh
4000h
7FFFh
8000h
BFFFh
C000h
FFFFh
\ 8
\ 8
\ 6
\ 8
\ 8
Device
Device
Device
(16k)
(16k)
(16k)
(16k)
EPROM
OE
64K PROGRAM
DATA AREA
ADDR(16-bit)
The EPMA register is a nonstandard 8-bit SFR at address 0A2H in the standard W78C32. To
read/write the EPMA register, one can use the "MOV direct" instruction or "read-modify-write"
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