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GMS81C2012 bảng dữ liệu(PDF) 77 Page - Hynix Semiconductor

tên linh kiện GMS81C2012
Giải thích chi tiết về linh kiện  CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver
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GMS81C2012 bảng dữ liệu(HTML) 77 Page - Hynix Semiconductor

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Hyundai Micro Electronics
GMS81C2020/GMS81C2120
Nov. 1999 Ver 0.0
preliminary
77
Figure 21-3 Application Example of Unused Input Port
Minimizing Current Consumption in Stop Mode
The Stop mode is designed to reduce power consumption.
To minimize current drawn during Stop mode, the user
should turn-off output drivers that are sourcing or sinking
current, if it is practical. Weak pull-ups on port pins should
be turned off, if possible. All inputs should be either as
VSS or at VDD (or as close to rail as possible).
An intermediate voltage on an input pin causes the input
buffer to draw a significant amount of current.
Figure 21-4 Timing of STOP Mode Release by External Interrupt
OUTPUT PIN
GND
i
In the left case, much current flows from port to GND.
X
ON
OFF
OUTPUT PIN
GND
i
In the left case, Tr. base current flows from port to GND.
i=0
X
OFF
ON
VDD
L
ON
OFF
OPEN
GND
VDD
L
ON
OFF
To avoid power consumption, there should be low output
ON
OFF
O
O
VDD
O
to the port .
STOP Mode
Normal Operation
Oscillator
(XI pin)
N+1
NN+2
00
01
FE
FF
00
00
N-1
N-2
Clear Basic Interval Timer
STOP Instruction Execution
Normal Operation
Stabilization Time
tST > 20mS
Internal
Clock
External
Interrupt
BIT
Counter



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