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W83977EF-AW Datasheet(PDF) 78 Page - Winbond |
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W83977EF-AW Datasheet(HTML) 78 Page - Winbond |
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78 / 142 page  W83977EF-AW/W83977EG-AW -76- 9.1 Basic I/O functions The Basic I/O functions of W83977EF/EG provide several I/O operations including driving a logic value to output port, latching a logic value from input port, inverting the input/output logic value, and steering Common Interrupt (only available in the second group of the GP I/O port). Common Interrupt is the ORed function of all interrupt channels in the second group of the GP I/O ports, and it also connects to a 1ms debounce filter which can reject a noise of 1 ms pulse width or less. There are two 8-bit registers (GP1 and GP2) which are directly connected to those GP I/O ports. Each GP I/O port is represented as a bit in one of three 8-bit registers. Only 6 bits of GP2 are implemented. Table 7.1.1 shows their combinations of Basic I/O functions, and Table 7.1.2 shows the register bit assignments of GP1 and GP2. Table 9.1.1 I/O BIT 0 = OUTPUT 1 = INPUT ENABLE INT BIT 0 = DISABLE 1 = ENABLE POLARITY BIT 0 = NON INVERT 1 = INVERT BASIC I/O OPERATIONS 0 0 0 Basic non-inverting output 0 0 1 Basic inverting output 0 1 0 Non-inverted output bit value of GP2 drive to Common Interrupt 0 1 1 Inverted output bit value of GP2 drive to Common Interrupt 1 0 0 Basic non-inverting input 1 0 1 Basic inverting input 1 1 0 Non-inverted input drive to Common Interrupt 1 1 1 Inverted input drive to Common Interrupt |
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