HD404354 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HD404354

4-bit HMCS400-series microcomputer

Hitachi -> Renesas Electronics 

HD404358 Series

Input/Output

The MCU has 33 input/output pins (D0–D8, R0–R4, R8) and an input pin (RA1). The features are described

below.

• Four pins (R20–R23) are high-current (15 mA max) input/output with intermediate voltage NMOS open

drain pins.

• The D0–D4, R0, R3–R4 input/output pins are multiplexed with peripheral function pins such as for the

timers or serial interface. For these pins, the peripheral function setting is done prior to the D or R port

setting. Therefore, when a peripheral function is selected for a pin, the pin function and input/output

selection are automatically switched according to the setting.

• Input or output selection for input/output pins and port or peripheral function selection for multiplexed

pins are set by software.

• Peripheral function output pins are CMOS output pins. Only the R02/SO pin can be set to NMOS open-

drain output by software.

• In stop mode, the MCU is reset, and therefore peripheral function selection is cancelled. Input/output

pins are in high-impedance state.

• Each input/output pin except for R2 has a built-in pull-up MOS, which can be individually turned on or

off by software.

I/O buffer configuration is shown in figure 19, programmable I/O circuits are listed in table 21, and I/O pin

circuit types are shown in table 22.

Table 21 Programmable I/O Circuits

MIS3 (bit 3 of MIS)

0

1

DCD, DCR

0

1

0

1

PDR

0

1

0

1

0

1

0

1

CMOS buffer

PMOS

—

—

—

On

—

—

—

On

NMOS

—

—

On

—

—

—

On

—

Pull-up MOS

—

—

—

—

—

On

—

On

Note: — indicates off status.

32

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