HS4318ESS01H datasheet(26/68 Pages) RENESAS

26 / 68 page

HD404318 Series

I/O Ports

The MCU has 33 input/output pins (D

0–D8, R0–R4, R8) and one input-only pin (RA1).

The following

describes the features of the I/O ports.

• The 21 pins consisting of D

0–D8, R1, R2, and R8 are all high-voltage I/O pins. RA1 is a high-voltage

input-only pin. These high-voltage pins can be equipped with or without pull-down resistance, as

selected by the mask option.

• All standard output pins are CMOS output pins. However, the R0

2/SO pin can be programmed for

NMOS open-drain output.

• In stop mode, input/output pins go to the high-impedance state

• All standard input/output pins have pull-up MOS built in, which can be individually turned on or off by

software

Table 5

Control of Standard I/O Pins by Program

MIS3 (bit 3 of MIS)

DCR

PDR

101

010

CMOS buffer

PMOS

—

NMOS

—

———On

—

Pull-up MOS

—

Note:

— indicates off.

Bit

Initial value

Read/Write

Bit name

DCR0, DCR3,

DCR4

Data control register

(DCR0: $030, DCR3: $033, DCR4: $034)

Bits 0 to 3

CMOS Buffer Control

CMOS buffer off

(high impedance)

CMOS buffer on

DCR0

DCR3

DCR4

Bit 3

R03

R33

R43

Correspondence between ports and DCR bits

Bit 2

R02

R32

R42

Bit 1

R01

R31

R41

Bit 0

R00

R30

R40

DCR03,

DCR33,

DCR43,

DCR02,

DCR32,

DCR42,

DCR01,

DCR31,

DCR41,

DCR00,

DCR30,

DCR40

Figure 17 Data Control Register (DCR)

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