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參數資料
型號: W921F840
廠商: WINBOND ELECTRONICS CORP
英文描述: 4-Bit Microcontroller(4位的微控制器)
中文描述: 4位微控制器(第4位的微控制器)
文件頁數: 17/68頁
文件大小: 451K
代理商: W921F840
W921F840
Publication Release Date: October 1997
- 17 -
Revision A1
OSCI
OSCO
or
OSCI
OSCO
RC type
Crystal Type
6.4 Initial State
The W921F840 is reset either by a power-on reset or by using the external RESETpin. The initial
state of the W921F840 after the reset function is executed is described below.
Program counter (PC)
Stack pointer
Special function registers
TM0, TM1, TM2, TM3 input clock
TM0, TM1, TM2, TM3 contents
Input / Output
PM registers
DTMF output
0000H
0FFH
Refer to section 6.2.1
Fosc / 8
0FFH
Input mode
1111B
Disable (H-Z)
6.5 Input/Output
There are 34 I/O pins including 4 large sink current pins in this chip. All the I/O pins will keep in the
input mode after power on reset.
The I/O instructions are described as follows:
MOV
MOV
MOV
MOV
A, Px
B, Px
Px, A
Px, B
Input port x to A accumulator
Input port x to B accumulator
Output A accumulator data to port x.
Output B accumulator data to port x.
1. The input or output status of port 2 to port 6 can be pin controlled by port mode register (PMx,
where x = 2 to 6). Data 0 of PMx indicates the corresponding pin as output mode, and data 1
indicates the relative pin as input mode. For example, MOV PM2, #0101B, it sets P2.0 and P2.2 in
input mode and P2.1 and P2.3 in output mode. The I/O instructions can't affect the I/O status in
Port 2 to Port 6.
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