HD6433045 HITACHI [Hitachi Semiconductor], HD6433045 Datasheet - Page 280

• Manufacturer Part Number: HD6433045
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: HITACHI [Hitachi Semiconductor]

9.9 Port 8
9.9.1 Overview
Port 8 is a 5-bit input/output port that is also used for CS
to IRQ
In modes 1 to 6 (expanded modes), port 8 can provide CS
to IRQ
In mode 7 (single-chip mode), port 8 can provide IRQ
selection of pin functions in single-chip mode.
The IRQ
input or output. For details see section 5, Interrupt Controller.
Pins in port 8 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor pair.
Pins P8
0
0
2
Port 8
input. Figure 9-8 shows the pin configuration of port 8.
input. See table 9-14 for the selection of pin functions in expanded modes.
3
to P8
to IRQ
0
have Schmitt-trigger inputs.
0
functions are selected by IER settings, regardless of whether the pin is used for
Port 8 pins
P8 /
P8 /
P8 /
P8 /
P8 /
Pin functions in mode 7
(single-chip mode)
P8 /(input/output)
P8 /(input/output)/
P8 /(input/output)/
P8 /(input/output)/
P8 /(input/output)/
4
3
2
1
0
4
3
2
1
0
Figure 9-8 Port 8 Pin Configuration
CS
CS
CS
CS
RFSH
0
1
2
3
/
/
/
IRQ
IRQ
IRQ
/
IRQ
3
2
1
0
IRQ
IRQ
IRQ
IRQ
267
Pin functions in modes 1 to 6
(expanded modes)
P8 (input)/
P8 (input)/
P8 (input)/
P8 (input)/
P8 (input/output)/
3
2
1
0
4
3
2
1
0
(input)
(input)
(input)
(input)
3
to IRQ
3
3
to CS
to CS
CS
CS
CS
CS
0
0
1
2
3
0
input. See table 9-15 for the
(output)
(output)/
(output)/
(output)/
0
output, RFSH output, and IRQ
output, RFSH output, and IRQ
RFSH
IRQ
IRQ
IRQ
(output)/
3
2
1
(input)
(input)
(input)
IRQ
0
(input)
3
3