Toshiba TLCS-900/H1 Series Manual page 133

3.7.16 Port N (PN0 to PN7)
PN0 to PN7 are 8-bit general-purpose I/O port. Each bit can be set individually for input
or output. Resetting sets Port N to an input port.
In addition to functioning as a general-purpose I/O port, Port N can also function as
key-board interface pin (KO0 to KO7) which can be set to open-drain output buffer.
Reset
(on bit basis)
(on bit basis)
PNFC write
S
Output latch
PN write
Direction
control
PNCR write
Function
control
Selector
PC read
Figure 3.7.42 Port N
92CF30-131
Open-drain
enable
S
B
A
TMP92CF30
PN0(KO0) to PN7(KO7)
2009-06-12