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MEC1322 датащи(PDF) 253 Page - Microchip Technology |
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MEC1322 датащи(HTML) 253 Page - Microchip Technology |
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253 / 456 page ![]() 2014 - 2015 Microchip Technology Inc. DS00001719D-page 253 MEC1322 APPLICATION NOTE: All GPIO interrupt detection configurations default to '0000', which is low level interrupt. Having interrupt detection enabled will un-gated the clock to the GPIO module whenever the interrupt is active, which increases power consumption. Interrupt detection should be disabled when not required to save power; this is especially true for pin interfaces (i.e., LPC). 20.8.2 PIN CONTROL REGISTER 2 20.8.3 GPIO OUTPUT REGISTERS If enabled by the Output GPIO Write Enable bit, the GPIO Output bits determine the level on the GPIO pin when the pin is configured for the GPIO output function. On writes: If enabled via the Output GPIO Write Enable 0: GPIO[x] out = ‘0’ 1: GPIO[x] out = ‘1’ If disabled via the Output GPIO Write Enable then the GPIO[x] out pin is unaffected by writing this bit. TABLE 20-8: EDGE ENABLE AND INTERRUPT DETECTION BITS DEFINITION Edge Enable Interrupt Detection Bits Selected Function D7 D6 D5 D4 0000 Low Level Sensitive 0001 High Level Sensitive 0010 Reserved 0011 Reserved 0100 Interrupt events are disabled 0101 Reserved 0110 Reserved 0111 Reserved 1101 Rising Edge Triggered 1110 Falling Edge Triggered 1111 Either edge triggered Note: Only edge triggered interrupts can wake up the main ring oscillator. The GPIO must be enabled for edge- triggered interrupts and the GPIO interrupt must be enabled in the interrupt aggregator in order to wake up the ring when the ring is shut down. Offset See Note 20-5 Bits Description Type Default Reset Event 31:6 RESERVED RES - - 5:4 Drive Strength These bits are used to select the drive strength on the pin. 00 = 2mA 01 = 4mA 10 = 8mA 11 = 12mA R/W Note 1: on page 248 VCC1_R ESET 3:1 RESERVED RES - - 0 Slew Rate This bit is used to select the slew rate on the pin. 0 = slow (half frequency) 1 = fast R/W 0 VCC1_R ESET |
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