HD6413003RVF RENESAS [Renesas Technology Corp], HD6413003RVF Datasheet - Page 258

• Manufacturer Part Number: HD6413003RVF
• Description: microcontroller (MCU)
• Manufacturer: RENESAS [Renesas Technology Corp]

9.2 Port 4
9.2.1 Overview
Port 4 is an 8-bit input/output port with the pin configuration shown in figure 9-1. The pin
functions differ between the 8-bit and 16-bit bus modes.
When the bus width control register (ABWCR) designates areas 0 to 7 all as 8-bit-access areas,
the H8/3003 operates in 8-bit bus mode and port 4 is a generic input/output port. When at least
one of areas 0 to 7 is designated as a 16-bit-access area, the H8/3003 operates in 16-bit bus mode
and port 4 becomes the lower data bus.
Port 4 has software-programmable built-in pull-up transistors.
Pins in port 4 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor pair.
Notes: 1.
2.
Port 4
Initial state in modes 1 and 3.
Initial state in modes 2 and 4.
Figure 9-1 Port 4 Pin Configuration
Port 4 pins
P4 /D
P4 /D
P4 /D
P4 /D
P4 /D
P4 /D
P4 /D
P4 /D
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
8-bit bus mode
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
240
7
6
5
4
3
2
1
0
*1
16-bit bus mode
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
7
6
5
4
3
2
1
0
*2