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參數資料
型號: W741E205
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-BIT FLASH MICROCONTROLLER
中文描述: 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDSO28
封裝: 0.300 INCH, SKINNY, PLASTIC, SOP-28
文件頁數: 27/84頁
文件大小: 541K
代理商: W741E205
Preliminary W741E20X
Publication Release Date: March 1998
- 27 -
Revision A1
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 W741E20X is reset either by a power-on reset or by using the external
RES
pin. The initial state
of the W741C200 after the reset function is executed is described below.
Program Counter (PC)
000H
TM0, TM1
Reset
MR0, MR1, PAGE registers
Reset
PSR0, PSR2, PM3 registers
Reset
IEF, HEF, HCF, PEF, EVF, SEF flags
Reset
Timer 0 input clock
Fosc/4
Timer 1 input clock
Fosc
MFP output
Low
Input/output ports RA, RB
Input mode
Input/output ports RC, RD
Input mode
Output port RE
High
RA and RB ports output type
CMOS type
Input clock of the watchdog timer
Fosc/1024
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