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| 型號(hào)： | GMS81C2120Q |
| 廠商： | HYNIX SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | MQFP-44 |
| 文件頁(yè)數(shù)： | 73/93頁(yè) |
| 文件大?。?/td> | 853K |
| 代理商： | GMS81C2120Q |
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GMS81C1404/GMS81C1408
June. 2001 Ver 1.2
71
20. 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 20-1 .
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 9-1 .
Figure 20-1 Timing Diagram after RESET
MAIN PROGRAM
Oscillator
(X
IN
pin)
FFFE FFFF
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
~
~
~
~
~
~
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