7.7
Port 6
7.7.1
Overview
Port 6 is an 8-bit input/output port that is multiplexed with input/output pins (FTOA, FTOB, FTIA
to FTID, FTCI) of the 16-bit free-running timer (FRT), with key-sense input pins, and with IRQ6
and IRQ7 input pins. The port 6 pin functions are the same in all operating modes. Figure 7.14
shows the pin configuration of port 6.
Port 6 has built-in, programmable MOS input pull-up transistors.
Pins in port 6 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor.
Port 6 pins
P67 (input/output)/IRQ7 (input)/KEYIN7 (input)
P66 (input/output)/FTOB (output)/IRQ6 (input)/KEYIN6 (input)
P65 (input/output)/FTID (input)/KEYIN5 (input)
P64 (input/output)/FTIC (input)/KEYIN4 (input)
Port 6
P63 (input/output)/FTIB (input)/KEYIN3 (input)
P62 (input/output)/FTIA (input)/KEYIN2 (input)
P61 (input/output)/FTOA (output)/KEYIN1 (input)
P60 (input/output)/FTCI (input)/KEYIN0 (input)
Figure 7.14 Port 6 Pin Configuration
7.7.2
Register Configuration and Descriptions
Table 7.12 summarizes the port 6 registers.
Table 7.12 Port 6 Registers
Name
Abbreviation
P6DDR
Read/Write
W
Initial Value
H'00
Address
H'FFB9
H'FFBB
H'FFF2
Port 6 data direction register
Port 6 data register
P6DR
R/W
H'00
Port 6 input pull-up control
register
KMPCR
R/W
H'00
129
HITACHI [ HITACHI SEMICONDUCTOR ]
