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參數資料
型號: W79E804A
廠商: WINBOND ELECTRONICS CORP
元件分類: 8位微控制器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁數: 13/115頁
文件大小: 1456K
代理商: W79E804A
W79E804A/803A/802A
Publication Release Date: July 16, 2007
- 13 -
Revision A2
ON-CHIP CODE MEMORY
PART NO.
EPROM
FLASH SIZE
START ADDRESS
END ADDRESS
W79E804
8KB
0000h
1FFFh
W79E803
4KB
0000h
0FFFh
W79E802
2KB
0000h
07FFh
Table
7-1: On-chip code memory address
7.3 Register Map
As mentioned before the W79E804 series have separate Program and Data Memory areas. The on-
chip
256
bytes scratch pad RAM is in addition to the external memory. There are also several Special
Function Registers (SFRs) which can be accessed by software. The SFRs can be accessed only by
direct addressing, while the on-chip RAM can be accessed by either direct or indirect addressing.
Indirect
RAM
Addressing
Direct
&
Indirect
RAM
Addressing
SFR
Direct
Addressing
Only
00H
7FH
80H
FFH
RAM and SFR Data Memory Space
Figure
7-2: W79E804 series RAM and SFR memory map
Since the scratch-pad RAM is only
256
bytes it can be used only when data contents are small. There
are several other special purpose areas within the scratch-pad RAM. These are described as follows.
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