HD4046212RFS datasheet(49/157 Pages) RENESAS

49 / 157 page

HD404629R Series

Notes: 1. Circuit constants differ by the different types of crystal oscillators, ceramic oscillators, and with

the stray capacitance of the board, so consult the manufacturer of the oscillator to determine the

circuit parameters.

2. The wiring between the OSC

1, OSC 2 (X1 and X2 pins), and the other elements should be as

short as possible, and must not cross other wiring. Refer to figure 28.

3. If not using a 32.768-kHz crystal oscillator, fix the X1 pin to V

CC and leave the X2 pin open.

Input/Output

The MCU has 42 input/output pins (D

0–D9, R00–R73) and 2 input pins (D10, D11).

The features are

described below.

• Ten pins (D

0–D9) are high-current input/output pins.

• The D

10 and D11, and R00–R73 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 R2

3/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 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 29, programmable I/O circuits are listed in table 23, and I/O pin

circuit types are shown in table 24.

Table 23 Programmable I/O Circuits

MIS3 (bit 3 of MIS)

DCD, DCR

PDR

010

101

CMOS buffer

PMOS

—

NMOS

—

Pull-up MOS

—

Note:

— indicates off status.

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