参数资料
型号: PC87393F-VJG
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 外设及接口
英文描述: 100-Pin LPC SuperI/O Devices for Portable Applications
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封装: TQFP-100
文件页数: 126/148页
文件大小: 1733K
代理商: PC87393F-VJG
3.0 General-Purpose Input/Output (GPIO) Port (Continued)
79
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3.4.6
GPIO Event Enable Register (GPEVEN)
Location:
Device specific
Type:
R/W
3.4.7
GPIO Event Status Register (GPEVST)
Location:
Device specific
Type:
R/W1C
Bit
76543210
Name
Event Enable
Reset
00000000
Bit
Description
7
Event Enable. Bits 7-0 correspond to pins 7-0 respectively. Each bit enables system notication triggering by
the corresponding GPIO pin. The bit has no effect on the corresponding Status bit in the GPEVST register.
0: IRQ generation by corresponding GPIO pin masked
1: IRQ generation by corresponding GPIO pin enabled
6
5
4
3
2
1
0
Bit
76543210
Name
Status
Reset
00000000
Bit
Description
7
Status. Bits 7-0 correspond to pins 7-0 respectively. Each bit is an edge detector that is set to 1 by the hardware
upon detection of an active edge (i.e. edge that matches the IRQ Polarity bit) on the corresponding GPIO pin.
This edge detection is independent of the Event Type or the Event Enable bit in the GPEVEN register. However,
the bit may reect the event status for enabled, edge-trigger event sources. Writing 1 to the Status bit clears it
to 0.
0: No active edge detected since last cleared
1: Active edge detected
6
5
4
3
2
1
0
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