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GMS81C5108 Datasheet(PDF) 84 Page - Hynix Semiconductor

No. de pieza GMS81C5108
Descripción Electrónicos  HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS
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Fabricante Electrónico  HYNIX [Hynix Semiconductor]
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GMS81C5108
JUNE 2001 Ver 1.0
81
22. RESET
The GMS81C5108 have two types of reset generation pro-
cedures; one is an external reset input, the other is a watch-
dog timer reset. Table 22-1 shows on-chip hardware ini-
tialization by reset action.
Table 22-1 Initializing Internal Status by Reset Action
22.1 External Reset Input
The reset input is the RESET pin, which is the input to a
Schmitt Trigger. A reset in accomplished by holding the
RESET pin to low for at least 8 oscillator periods, within
the operating voltage range and oscillation stable, it is ap-
plied, and the internal state is initialized. After reset,
65.5ms (at 4MHz) add with 7 oscillator periods are re-
quired to start execution as shown in Figure 22-2.
Internal RAM is not affected by reset. When VDD is turned
on, the RAM content is indeterminate. Therefore, this
RAM should be initialized before read or tested it.
When the RESET pin input goes to high, the reset opera-
tion is released and the program execution starts at the vec-
tor address stored at FFFEH - FFFFH.
A connection for simple power-on-reset is shown in Figure
22-1.
Figure 22-1 Simple Power-on-Reset Circuit
Figure 22-2 Timing Diagram after RESET
22.2 Watchdog Timer Reset
Refer to “13.2 Watch Dog Timer” on page 57.
On-chip Hardware
Initial Value
On-chip Hardware
Initial Value
Program counter
(PC)
(FFFFH) - (FFFEH)
Peripheral clock
On
RAM page register
(RPR)
0
SVD
Enable
G-flag
(G)
0
Control registers
Refer to Table 8-1 on page 25
Operation mode
Main-frequency clock
Voltage Booster
Disable
RESET
+
VDD
VDD
GND
Mask Option
MCU
100k
1uF
MAIN PROGRAM
System Clock
?
?
FFFE FFFF
Stabilization Time
tST = 65.5mS at 4MHz
RESET
ADDRESS
DATA
1
2
3
4
5
6
7
??
Start
?
?
?
FE
?
ADL
ADH
OP
BUS
BUS
RESET Process Step
tST =
x 256
fMAIN ÷1024
1


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