HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 173

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

Pin Functions in Single-Chip Mode: In the single-chip mode (mode 7), each of the port 3 pins
can be designated as an input pin or an output pin, as indicated in figure 9-7, by setting the
corresponding bit in P3DDR to 1 for output or clearing it to 0 for input.
9.5 Port 4
9.5.1 Overview
Port 4 is an 8-bit input/output port with the pin configuration shown in figure 9-8. In the
expanded modes it provides the low bits (A
operates as a general-purpose input/output port.
Outputs from port 4 can drive one TTL load and a 90 pF capacitive load. They can also drive a
Darlington transistor pair or LED (with 10 mA current sink).
Port
4
P4
P4
P4
P4
P4
P4
P4
P4
Pin
Figure 9-7 Port 3 Pin Functions in Single-Chip Mode
7
6
5
4
3
2
1
0
/ A
/ A
/ A
/ A
/ A
/ A
/ A
/ A
Port
7
6
5
4
3
2
1
0
3
Figure 9-8 Pin Functions of Port 4
Expanded Modes
A
A
A
A
A
A
A
A
7
6
5
4
3
2
1
0
(output)
(output)
(output)
(output)
(output)
(output)
(output)
(output)
7
P3
P3
P3
P3
P3
P3
P3
P3
– A
7
6
5
4
3
2
1
0
156
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
0
) of the address bus. In the single-chip mode it
Single-Chip Mode
P4
P4
P4
P4
P4
P4
P4
P4
7
6
5
4
3
2
1
0
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)