UPD9971 datasheet(14/112 Pages) RENESAS

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µPD9971

Data Sheet S17455EJ2V0DS

2.3 Descriptions of Pin Functions

(1) Power supply pins and GND pins

Pin Name

Pin No.

I/O

Functions

DVDD

4C, 7C, 7H,

8F, 10D

−

Power supply for digital blocks

When using an internal regulator, connect this pin and the REGOUT pin on the

outside of the

µPD9971.

Be sure to connect a 0.1

µF capacitor between this pin and DGND.

DGND

5C, 5K

−

Ground for digital blocks

EVDD

8H, 9C

−

Power supply for digital I/O

Be sure to connect a 0.1

µF capacitor between this pin and EGND.

EGND

6A, 8G

−

Ground for digital I/O

PLLVDD

−

Power supply for PLL

Be sure to connect a 0.1

µF capacitor between this pin and PLLGND.

PLLGND

−

Ground for PLL

AVDD

−

Power supply for analog blocks

Be sure to connect a 0.1

µF capacitor between this pin and AGND.

AGND

−

Ground for analog blocks

AGND2

−

Ground for analog blocks

REGVDD

1J, 3H

−

Power supply for regulator band gap reference

Be sure to connect a 0.1

µF capacitor between this pin and REGGND.

REGGND

−

Ground for regulators

(2) Clock and system control pins

Pin Name

Pin No.

I/O

Functions

MCLK1

Input

Clock input (3.84 MHz to 15.36 MHz)

This is the reference clock input to generate the internal master clock.

Be sure to input using capacitive coupling (1000 pF).

Connect this pin to GND when the pin is not used.

MCLK2

Input

Clock input (3.84 MHz to 15.36 MHz)

This is the reference clock input to generate the internal master clock.

This pin is also used for inputting square waves of input level EVDD.

Connect this pin to GND when the pin is not used.

CSTRT

Input

Signal input to select clock input from outside

Cautions

This pin is valid when the CSTRTEN register is high level.

When the CSTRT pin does switching, however, only limited

frequencies can be input. Before using this pin, be sure to

contact NEC Electronics.

0: Selects input from MCLK2.

1: Selects input from MCLK1

This pin is pulled down in the

µPD9971.

RESET_B

Input

Hardware reset signal input

This resets the

µPD9971.

0: Resets.

1: Cancels the reset.

Registers are initialized to their initial values after a reset.

UPD9971 Datasheet(PDF) 14 Page - Renesas Technology Corp

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