W83977F-A Datasheet, PDF (121/182 Pages) Winbond – WINBOND I/O

W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
Figure 11.2
11.1 Basic I/O functions
The Basic I/O functions of W83977F/G, W83977AF/AG 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 both groups of GP
I/O ports. Each GP I/O port is represented as a bit in one of two 8-bit registers. Only 6 bits of GP2
are implemented. Table 11.1.1 shows their combinations of Basic I/O functions, and Table 11.1.2
shows the register bit assignments of GP1 and GP2.
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Publication Release Date: May 2006
Revision 0.60