Toshiba TMP96C141AF Manual page 41

3.5.9 Port 8 (P80 - P83)
Port 8 is an 8-bit general-purpose I/O port. I/O can be set on a
bit basis. Resetting sets Port 8 as an input port and connects
a pull-up resistor. It also sets all bits of the output latch register
P8 to 1. In addition to functioning as a general-purpose I/O
port, Port 8 also functions as an input for 16-bit timer 4 and 5
(1) P80 ~ P86
TOSHIBA CORPORATION
clocks, an output for 16-bit timer F/F 4, 5 and 6 output, and an
input for INT0. Writing 1 in the corresponding bit of the Port 8
function register (P8FC) enables those functions. Resetting
resets the function register P8FC value to 0, and sets all bits to
ports.
Figure 3.5 (17). Port 8 (P80 - P86)
TMP96C141AF
41