HD6417618A datasheet(494/646 Pages) RENESAS

494 / 646 page

Section 17 I/O Ports

Rev. 6.00 Jun. 12, 2007 Page 462 of 610

REJ09B0131-0600

17.3.1

Port C is a 21-bit I/O port that has the following registers. For details on the addresses of these

registers and the states of these registers in each processing state, see section 20, List of Registers.

• Port C data register H (PCDRH)

• Port C data register L (PCDRL)

17.3.2

Port C Data Registers H and L (PCDRH and PCDRL)

PCDRH and PCDRL are 16-bit readable/writable registers that stores data for port C. Bits

PC20DR to PC0DR correspond to pins PC20 to PC00. (Description of multiplexed functions is

omitted.)

When the pin function is general output port, if the value is written to PCDRH or PCDRL, the

value is output from the pin; if PCDRH or PCDRL is read, the value written to the register is

directly read regardless of the pin state.

When the pin function is general input port, not the value of register but pin state is directly read if

PCDRH or PCDRL is read. Data can be written to PCDRH or PCDRL but no effect on the pin

state. Table 17.3 shows the reading/writing function of the port C data registers H and L.

• PCDRH

Bit

Bit Name

Initial

Value

R/W

Description

15 to 5



All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

PC20DR

R/W

See table 17.3.

PC19DR

R/W

PC18DR

R/W

PC17DR

R/W

PC16DR

R/W

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