W83977EF Winbond Electronics Corp America, W83977EF Datasheet - Page 82

• Manufacturer Part Number: W83977EF
• Description: Description = W83877TF Plus Kbc, GP I/O, Wake-Up, Power Fail Resume ;; Package = QFP 128
• Manufacturer: Winbond Electronics Corp America

W83977EF
7.0 General Purpose I/O
W83977EF provides 14 Input/Output ports that can be individually configured to perform a simple
basic I/O function or a pre-defined alternate function. Those 14 GP I/O ports are divided into three
groups, the first group contains 8 ports, and the second group contains only 6 ports. Each port in first
group corresponds to a configuration register in logical device 7, and the second group in logical
device 8.
Users can select those I/O ports functions by independently programming those
configuration registers. Figure 7.1, 7.2, and 7.3 respectively show the GP I/O port's structure of
logical device 7 and 8. Right after Power-on reset, those ports default to perform basic I/O functions.
Figure 7.1
Publication Release Date: April 2003
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Revision 1.1