HD6475348R Datasheet, PDF (170/487 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

Pin Functions in Single-Chip Mode: In the single-chip mode (mode 7), each of the port 2 pins
can be designated as an input pin or an output pin, as indicated in figure 9-4, by setting the
corresponding bit in P2DDR to 1 for output or clearing it to 0 for input.
P24 (input/output)
Port
P23 (input/output)
2
P22 (input/output)
P21 (input/output)
P20 (input/output)
Figure 9-4 Port 2 Pin Functions in Single-Chip Mode
9.4 Port 3
9.4.1 Overview
Port 3 is an 8-bit input/output port with the pin configuration shown in figure 9-5. In the
expanded modes it operates as the external data bus (D7 – D0). In the single-chip mode it operates
as a general-purpose input/output port.
Outputs from port 3 can drive one TTL load and a 90pF capacitive load. They can also drive a
Darlington transistor pair.
Pin
Expanded Modes
Single-Chip Mode
P37 / D7
D7 (input/output)
P37 (input/output)
P36 / D6
D6 (input/output)
P36 (input/output)
P35 / D5
D5 (input/output)
P35 (input/output)
Port
P34 / D4
D4 (input/output)
P34 (input/output)
3
P33 / D3
D3 (input/output)
P33 (input/output)
P32 / D2
D2 (input/output)
P32 (input/output)
P31 / D1
D1 (input/output)
P31 (input/output)
P30 / D0
D0 (input/output)
P30 (input/output)
Figure 9-5 Pin Functions of Port 3
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