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參數資料
型號: W741C20X
廠商: WINBOND ELECTRONICS CORP
英文描述: 4-BIT MICROCONTROLLER
中文描述: 4位微控制器
文件頁數: 27/84頁
文件大小: 486K
代理商: W741C20X
Preliminary W741C20X
Publication Release Date: March 1998
- 27 -
Revision A3
Event Flag (EVF)
The event flag is organized as a 8-bit binary register (EVF0 to EVF7). It is set by hardware and reset
by CLR EVF,#I instruction or the occurrence of an interrupt. The bit descriptions are as follows:
R
R
R
R
EVF
0
1
2
3
4
5
R
R
R
6
7
Note: R means read only.
EVF.0 = 1 Overflow from Divider 0 occurred.
EVF.1 = 1 Underflow from Timer 0 occurred.
EVF.2 = 1 Signal change at port RC occurred.
EVF.3 is reserved.
EVF.4 = 1 Falling edge signal at the
INT
pin occurred.
EVF.5 = 1 The serial port received completely.
EVF.6 = 1 The serial port transmitted completely.
EVF.7 = 1 Underflow from Timer 1 occurred.
Reset Function
The W741C20X is reset either by a power-on reset or by using the external
RES
pin. The initial state
of the W741C20X after the reset function is executed is described below.
Program Counter (PC)
TM0, TM1
MR0, MR1, PAGE registers
PSR0, PSR2, PM3 registers
IEF, HEF, HCF, PEF, EVF, SEF
flags
Timer 0 input clock
Timer 1 input clock
MFP output
Input/output ports RA, RB
Input/output ports RC, RD
Output port RE
RA and RB ports output type
Input clock of the watchdog timer
000H
Reset
Reset
Reset
Reset
F
OSC
/4
F
OSC
Low
Input mode
Input mode
High
CMOS type
F
OSC
/1024
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相關代理商/技術參數
參數描述
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