參數(shù)資料
型號: GMS81C5024-XXXQ
英文描述: MICROCONTROLLER|8-BIT|CMOS|QFP|44PIN|PLASTIC
中文描述: 單片機(jī)| 8位|的CMOS | QFP封裝| 44PIN |塑料
文件頁數(shù): 73/93頁
文件大?。?/td> 853K
代理商: GMS81C5024-XXXQ
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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