w83977ctf Winbond Electronics Corp America, w83977ctf Datasheet - Page 93

• Manufacturer Part Number: w83977ctf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

W83977EF/ CTF
PRELIMINARY
7.0 GENERAL PURPOSE I/O
W83977EF/CTF provides 14 Input/Output ports that can be individually configured to perform a
simple basic I/O function or a pre-defined alternate function. These 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 the first group corresponds to a configuration register in logical device 7, and those in the second
group to one in logical device 8.
Users can select the I/O ports' functions by independently
programming these configuration registers. Figures 7.1, 7.2, and 7.3 respectively show the GP I/O
port structure of logical device 7 and 8. Right after Power-on reset, these ports default to perform
basic I/O functions.
Figure 7.1
Publication Release Date: March 1999
-84 -
Revision A1