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參數(shù)資料
型號: HMS87C1304AD
廠商: HYNIX SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
中文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO24
封裝: SOP-24
文件頁數(shù): 61/70頁
文件大小: 977K
代理商: HMS87C1304AD
HYUNDAI MicroElectronics
HMS87C1304A/HMS87C1302A
Jan. 2001
Preliminary
61
18. RESET
The reset input is the RESET pin, which is the input to a
Schmitt Trigger. A reset in accomplished by holding the
RESET pin low for at least 8 oscillator periods, while the
oscillator running. After reset, 64ms (at 4 MHz) add with
7 oscillator periods are required to start execution as shown
in Figure 18-1 .
Internal RAM is not affected by reset. When V
DD
is turned
on, the RAM content is indeterminate. Therefore, this
RAM should be initialized before reading or testing it.
Initial state of each register is shown as Table 8-1 .
Figure 18-1 Timing Diagram after RESET
MAIN PROGRAM
Oscillator
(X
IN
pin)
Stabilizing Time
t
ST
= 64mS at 4MHz
RESET
ADDRESS
BUS
DATA
BUS
1
2
3
4
5
6
7
Start
FE
ADL
ADH
OP
RESET Process Step
~
~
~
~
~
~
Preimnary
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