HD6413003RVF RENESAS [Renesas Technology Corp], HD6413003RVF Datasheet - Page 261

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HD6413003RVF

Manufacturer Part Number
HD6413003RVF
Description
microcontroller (MCU)
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
9.2.3 Pin Functions in Each Mode
The functions of port 4 differ depending on whether 8-bit or 16-bit bus mode is selected by
ABWCR settings. The pin functions in each mode are described below.
8-Bit Bus Mode: Input or output can be selected separately for each pin in port 4. A pin becomes
an output pin if the corresponding P4DDR bit is set to 1 and an input pin if this bit is cleared to 0.
Figure 9-2 shows the pin functions in 8-bit bus mode. This is the initial state in modes 1 and 3.
16-Bit Bus Mode: The input/output settings in P4DDR are ignored. Port 4 automatically becomes
a bidirectional data bus. Figure 9-3 shows the pin functions in 16-bit bus mode. This is the initial
state in modes 2 and 4.
Figure 9-2 Pin Functions in 8-Bit Bus Mode (Port 4)
Port 4
243
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
P4 (input/output)
7
6
5
4
3
2
1
0

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