HD6433713 datasheet(116/324 Pages) RENESAS

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Section 7 I/O Ports

7.1 Overview

The H8/3714 Series has five 8-bit I/O ports (of which four are high-voltage ports), one 6-bit I/O

port*, and one 8-bit input port. Table 7-1 indicates the functions of each port.

Ports 1 and 9 are standard input/output ports, consisting of a port control register (PCR) that

controls input and output, and a port data register (PDR) for storing output data. Input or output

can be assigned to individual bits.

Ports 4, 5, 6, and 7 are high-voltage ports, able to handle an applied voltage of VCC – 40 V. Input

and output are controlled for individual bits by reading from and writing to PDR.

Note: * Pin P17 of port 1 is a high-voltage input-only pin, while pin P16 is a standard input-only

pin. Pins P12 and P13 are not present.

Reading a port gives the following results.

•

Reading a standard port

— Reading a pin assigned to general-purpose input (PCR = 0) gives the pin level.

— Reading a pin assigned to general-purpose output (PCR = 1) gives the value of the

corresponding PDR bit.

— Reading a pin assigned to an on-chip peripheral function gives the pin level.

•

Reading a high-voltage port

— Reading a pin assigned to general-purpose input/output gives the pin level.

— Reading a pin assigned to digit output or segment output use gives the value of the

corresponding PDR bit.

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HD6433713 Datasheet(PDF) 116 Page - Renesas Technology Corp