H8S2245 datasheet(296/818 Pages) RENESAS

296 / 818 page

Section 8 I/O Ports

Rev.3.00 Mar. 26, 2007 Page 254 of 772

REJ09B0355-0300

8.9.2

Table 8.15 shows the port C register configuration.

Table 8.15

Port C Registers

Name

Abbreviation

R/W

Initial Value

Address*

Port C data direction register

PCDDR

H'00

H'FEBB

Port C data register

PCDR

R/W

H'00

H'FF6B

Port C register

PORTC

Undefined

H'FF5B

Port C MOS pull-up control register

PCPCR

R/W

H'00

H'FF72

Note:

Lower 16 bits of the address.

Port C Data Direction Register (PCDDR)

PC7DDR

PC6DDR

PC5DDR

PC4DDR

PC3DDR

PC0DDR

PC2DDR

PC1DDR

Bit

Initial value

R/W

PCDDR is an 8-bit write-only register, the individual bits of which specify input or output for the

pins of port C. PCDDR cannot be read; if it is, an undefined value will be read.

This register is a write-only register, and cannot be written by bit manipulation instruction. For

details, see section 2.10.4, Access Methods for Registers with Write-Only Bits.

PCDDR is initialized to H'00 by a power-on reset and in hardware standby mode. It retains its

prior state after a manual reset, and in software standby mode. The OPE bit in SBYCR is used to

select whether the address output pins retain their output state or become high-impedance when a

transition is made to software standby mode.

• Modes 1, 4, and 5

The corresponding port C pins are address outputs irrespective of the value of the PCDDR bits.

• Modes 2 and 6

Setting a PCDDR bit to 1 makes the corresponding port C pin an address output, while

clearing the bit to 0 makes the pin an input port.

Note:

Modes 2 and 6 cannot be used in the H8S/2240.

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