參數(shù)資料
型號: EM73400
廠商: ELAN Microelctronics Corp .
英文描述: 4-Bit Micro-Controller for General-Purpose Product(用于通訊產(chǎn)品,家用電器,消費(fèi)類產(chǎn)品的工作電壓4.5-5.5V的4位微控制器)
中文描述: 4位微控制器一般通用產(chǎn)品(用于通訊產(chǎn)品,家用電器,消費(fèi)類產(chǎn)品的工作電壓4.5 - 5.5V的的4位微控制器)
文件頁數(shù): 28/38頁
文件大?。?/td> 197K
代理商: EM73400
28
* This specification are subject to be changed without notice.
6.11.1998
EM73400
4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT
RESETTING FUNCTION
When CPU in normal working condition and RESET pin holds in low level for three instruction cycles at least,
then CPU begins to initialize the whole internal states, and when RESET pin changes to high level, CPU begins
to work in normal condition.
The CPU internal state during reset condition is as following table :
Hardware condition in RESET state
Program counter
Status flag
Interrupt enable flip-flop ( EI )
MASK0 ,1, 2, 3
Interrupt latch ( IL )
P16, 25, 28, 29, 31
P1, 2, 4, 5, 6, 7, 8, 9, 20
XIN
Initial value
000h
01h
00h
00h
00h
00h
0Fh
Start oscillation
The RESET pin is a hysteresis input pin and it has a pull-up resistor available by mask option.
The simplest RESET circuit is connect RESET pin with a capacitor to V
SS
and a diode to V
DD
.
RESET
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