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GMS81C2012 Datasheet(PDF) 81 Page - Hynix Semiconductor

Part # GMS81C2012
Description  CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver
PDF  92 Pages
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Manufacturer  HYNIX [Hynix Semiconductor]
Direct Link  http://www.skhynix.com/kor/main.do
Logo HYNIX - Hynix Semiconductor

GMS81C2012 Datasheet(HTML) 81 Page - Hynix Semiconductor

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Hyundai Micro Electronics
GMS81C2020/GMS81C2120
Nov. 1999 Ver 0.0
preliminary
81
22. 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 26-2 .
Internal RAM is not affected by reset. When VDD 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 11-3 .
Figure 22-1 Timing Diagram after RESET
MAIN PROGRAM
Oscillator
(XI pin)
?
?
FFFE FFFF
Stabilization Time
tST = 64mS at 4MHz
RESET
ADDRESS
DATA
1
2
3
4
5
6
7
??
Start
?
?
?
FE
?
ADL
ADH
OP
BUS
BUS
RESET Process Step



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