W83977ATF Datasheet, PDF (104/207 Pages) Winbond – WINBOND I/O

W83977ATF
PRELIMINARY
7.0 GENERAL PURPOSE I/O
W83977ATF provides 23 Input/Output ports that can be individually configured to perform a simple
basic I/O function or a pre-defined alternate function. These 23 GP I/O ports are divided into three
groups; the first group contains 8 ports, the second group contains only 7 ports, and the third group
contains 8 ports. Each port in the first group corresponds to a configuration register in logical device
7, the second group in logical device 8, and the third group in logical device 9. Users can select
these I/O ports functions by independently programming the configuration registers. Figure 7.1, 7.2,
and 7.3 show the GP I/O port's structure of logical device 7, 8, and 9 respectively. Right after Power-
on reset, those ports default to perform basic I/O functions.
Figure 7.1
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Publication Release Date:April 1998
Revision 0.53