7.7.3
Pin Functions
Port 6 has the same pin functions in all operating modes. The pins are multiplexed with FRT
input/output, IRQ6 and IRQ7 input, and key-sense input. Table 7.13 indicates the pin functions of
port 6.
Table 7.13 Port 6 Pin Functions
Pin
Pin Functions and Selection Method
P67/IRQ7/
KEYIN7
P67DDR
0
1
Pin function
P67 input
P67 output
IRQ7 input* or KEYIN7 input
Note: * IRQ7 input is usable when bit IRQ7E is set to 1 in IER
Bit OEB in TOCR of the FRT and bit P66DDR select the pin function as follows
P66/FTOB/
IRQ6/KEYIN6
OEB
0
1
P66DDR
Pin function
0
1
0
1
P66 input
P66 output
FTOB output
IRQ6 input* or KEYIN6 input
Note: * IRQ6 input is usable when bit IRQ6E is set to 1 in IER
P65/FTID/
KEYIN5
P65DDR
0
1
Pin function
P65 input
P65 output
FTID input or KEYIN5 input
P64/FTIC/
KEYIN4
P64DDR
0
1
Pin function
P64 input
P64 output
FTIC input or KEYIN4 input
132
HITACHI [ HITACHI SEMICONDUCTOR ]
