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S3C72P9 Datasheet(PDF) 70 Page - Samsung semiconductor

Part # S3C72P9
Description  SINGLE-CHIP MICROCONTROLLER HAS BEEN DESIGNED FOR HIGH PERFORMANCE USING
PDF  225 Pages
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Manufacturer  SAMSUNG [Samsung semiconductor]
Direct Link  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

S3C72P9 Datasheet(HTML) 70 Page - Samsung semiconductor

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MEMORY MAP
S3C72P9/P72P9 (Preliminary Spec)
4-20
IMODK — External Key Interrupt Mode Register
CPU
FB6H
Bit
3
2
1
0
Identifier
"0"
IMODK.2
IMODK.1
IMODK.0
RESET
RESET Value
0
0
0
0
Read/Write
W
W
W
W
Bit Addressing
4
4
4
4
IMODK.3
Bit 3
0
Always logic zero
IMODK.2
External Key Interrupt Edge Detection Selection Bit
0
Falling edge detection
1
Rising edge detection
IMODK.1 – .0
External Key Interrupt Mode Control Bits
0
0
Disable key interrupt
0
1
Enable edge detection at K0–K3 pins
1
0
Enable edge detection at K4-K7 pins
1
1
Enable edge detection at K0–K7 pins
NOTES:
1.
To generate a key interrupt, all of the selected pins must be configured to input mode. If any one of the selected pins
is configured to output mode, only falling edge can be detected.
2.
To generate a key interrupt, all of the selected pins must be at input high state for falling edge detection, or all of the
selected pins must be at input low state for rising edge detection. If any one of them or more is at input low state or
input high state, the interrupt may be not occurred at falling edge or rising edge.
3.
To generate a key interrupt, first, configure pull-up resistors or external pull-down resistors. And then, select edge
detection and pins by setting IMODK register.



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