HD404374FT datasheet(59/161 Pages) RENESAS

59 / 161 page

HD404374/HD404384/HD404389/HD404082/HD404084 Series

Rev.5.00, Sep.11.2003, page 59 of 161

Input/Output

The MCU has 20 input/output pins (D

0 to D9, R0, R10, R13, R20 to R22, R70 to R73).

The features of these

pins are described below.

• The four pins D

0 to D3 are source large-current (10 mA max.) I/O pins.

• The four pins D

4 to D7 are sink large-current (15 mA max.) I/O pins.

• I/O pins comprise pins (D

0, R00, R10, R13, R20 to R22, R70 to R73) that also have a peripheral function

(timer, serial interface, etc.). With these pins, the peripheral function setting has priority over the D port

or R port pin setting. When a peripheral function setting has been made for a pin, the pin function and

input/output mode will be switched automatically in accordance with that setting.

• Selection of input or output for I/O pins, or selection of the port or peripheral function for pins

multiplexed as peripheral function pins, is performed by the program.

• All output of the peripheral function pins are CMOS outputs. The SO pin and R2

2 port pin can be

designated as NMOS open-drain output by the program.

• A reset clears peripheral function selection. And since the data control registers (DCD, DCR) are also

reset, input/output pins go to the high-impedance state.

• Each I/O pin has a built-in pull-up MOS that can be turned on and off individually by the program.

Figure 24 shows the I/O buffer configuration, and table 22 shows I/O pin circuit configuration control by

the program.

Table 23 shows the circuit configuration of each I/O pin.

Pull-up

MOS

Pull-up control signal

Buffer control signal

Output data

Input data

VCC

PMOS

NMOS

Input control signal

MIS3

DCD, DCR

PDR

VCC

Figure 24 I/O Pin Circuit Configuration

HD404374FT Datasheet(PDF) 59 Page - Renesas Technology Corp

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