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參數(shù)資料
型號(hào)： W921E880
廠商： WINBOND ELECTRONICS CORP
元件分類(lèi)： 微控制器/微處理器
英文描述： 4-Bit Microcontroller(4位的微控制器)
中文描述： 4-BIT, EEPROM, 4 MHz, MICROCONTROLLER, PQFP80
封裝： QFP-80
文件頁(yè)數(shù)： 14/62頁(yè)
文件大小： 511K
代理商： W921E880
W921E880
- 14 -
6.4 Initial State
The W921E880 is reset either by power-on reset or by using the external
RESET
pin. The initial state
of the W921E880 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 special control register table
F
OSC/
8
0FFH
Input mode
1111B
Disable (H-Z)
6.5 Input/Output
There are 64 I/O pins (4 pins
×
16 ports) including 12 large drive current pins, and 12 large sink
current pins in this chip. All the I/O pins will remain in an input mode after a power on reset.
The input or output status of port 0 to port 7 can be controlled by the port mode register PMx, where x
= 0 to 7. A zero indicates the corresponding pin is an output, a one indicates the relative pin is an
input. For example, MOV PM0, #0101B sets P0.0 and P0.2 as inputs and P0.1 and P0.3 as outputs.
The I/O instructions cannot affect the I/O status in Port 0 to Port 7.
The input or output mode of port 8 to port F only can be decided by I/O instructions. For example,
MOV A, Px will change Px to input mode and MOV Px, A will change it to output mode.
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 reg.
input Port x to B reg.
output A reg. data to Port x.
output B reg. data to Port x.
* P0.0
P0.3:
Four 10 mA drive current pins
Normal I/O pins only.
* P1.0
P1.3:
Four 10 mA drive current pins
Normal I/O pins only.
Normal function is the same as port P0
* P2.0
P2.3:
Four 15 mA sink current pins
Normal I/O pins only.
Normal function is the same as port P0
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