HD6433045 HITACHI [Hitachi Semiconductor], HD6433045 Datasheet - Page 272

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HD6433045

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

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9.6 Port 5
9.6.1 Overview
Port 5 is a 4-bit input/output port with the pin configuration shown in figure 9-5. The pin functions
differ depending on the operating mode.
In modes 1 to 4 (expanded modes with on-chip ROM disabled), port 5 consists of address output
pins (A
port 5 data direction register (P5DDR) designate pins for address bus output (A
generic input. In mode 7 (single-chip mode), port 5 is a generic input/output port.
Port 5 has software-programmable built-in pull-up MOS transistors.
Pins in port 5 can drive one TTL load and a 90-pF capacitive load. They can also drive an LED or
a darlington transistor pair.
9.6.2 Register Descriptions
Table 9-8 summarizes the registers of port 5.
Table 9-8 Port 5 Registers
Address*
H'FFC8
H'FFCA
H'FFDB
Note: * Lower 16 bits of the address.
Port 5
19
to A
Name
Port 5 data direction register
Port 5 data register
Port 5 input pull-up MOS
control register
16
). In modes 5 and 6 (expanded modes with on-chip ROM enabled), settings in the
Port 5
pins
P5 /A
P5 /A
P5 /A
P5 /A
3
2
1
0
19
18
17
16
Figure 9-5 Port 5 Pin Configuration
Modes 1 to 4
A
A
A
A
19
18
17
16
(output)
(output)
(output)
(output)
259
Abbreviation
P5DDR
P5DR
P5PCR
Modes 5 and 6
P5 (input)/A
P5 (input)/A
P5 (input)/A
P5 (input)/A
3
2
1
0
R/W
W
R/W
R/W
19
18
17
16
(output)
(output)
(output)
(output)
Modes 1 to 4
H'FF
H'F0
H'F0
Initial Value
19
Mode 7
P5 (input/output)
P5 (input/output)
P5 (input/output)
P5 (input/output)
to A
3
2
1
0
16
Modes 5 to 7
H'F0
H'F0
H'F0
) or

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