H8SSLASH2218 datasheet(293/750 Pages) RENESAS

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Section 8 I/O Ports

Rev.6.00 Jun. 03, 2008 Page 245 of 698

REJ09B0074-0600

8.8

Port C (H8S/2218 Group Only)

The port C is an 8-bit I/O port also functioning as address bus (A7 to A0) output pins. The port C

has the following registers.

Note:

When the RTC and USB are used while the E6000 emulator is used, the PC7DDR to

PC0DDR bits in PCDDR must be set so that the PC7 to PC0 pins output addresses A7 to

A0. This note applies to both the H8S/2218 Group and H8S/2212 Group.

• Port C data direction register (PCDDR)

• Port C data register (PCDR)

• Port C register (PORTC)

• Port C pull-up MOS control register (PCPCR)

8.8.1

Port C Data Direction Register (PCDDR)

PCDDR specifies input or output for the pins of the port C.

Since PCDDR is a write-only register, the bit manipulation instructions must not be used to write

PCDDR. For details, see section 2.9.4, Accessing Registers Containing Write-Only Bits.

Bit

Bit Name Initial Value

R/W

Description

PC7DDR

PC6DDR

PC5DDR

PC4DDR

PC3DDR

PC2DDR

PC1DDR

PC0DDR

Modes 4 and 5:

Port C pins are address output pins.

Mode 6:

Setting a PCDDR bit to 1 makes the corresponding port C

pin an address output pin, while clearing the bit to 0

makes the pin an input port.

Mode 7:

Setting a PCDDR bit to 1 makes the corresponding port C

pin an output port, while clearing the bit to 0 makes the

pin an input port.

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