UPD77210 datasheet(21/74 Pages) NEC

21 / 74 page

Data Sheet U15203EJ3V0DS

µµµµPD77210, 77213

1.2 Connection of Unused Pins

1.2.1 Connection of functional pins

Connect the unused pins as shown in the table below.

Pin Name

I/O

Recommended Connection

STOPS, HALTS

Output

Leave open.

CSTOP

Input

Connect to GND via a pull-down resistor.

CLKOUT

Output

Leave open.

P0 to P15

I/O

Connect to EVDD via a pull-up resistor or to GND via a pull-down resistor.

HD0 to HD7

Note 1

I/O

Connect to EVDD via a pull-up resistor or to GND via a pull-down resistor.

HA0, HA1

Input

Connect to EVDD via a pull-up resistor or to GND via a pull-down resistor.

HCS, HRD, HWR

Input

Connect to EVDD via a pull-up resistor.

HRE, HWE

Output

Leave open.

TIMOUT

Output

Leave open.

ASCK, TSCK

Input

ASI, TSI

Input

Connect to EVDD via a pull-up resistor or to GND via a pull-down resistor.

ASIEN, TSIEN

Input

ASOEN, TSOEN,

LRCLK

Input

Connect to GND via a pull-down resistor.

ASO, TSO

Output

TSORQ

Output

TSIAK

Output

Leave open.

MA0 to MA19

Output

Leave open.

MD0 to MD15

Note 2

I/O

Connect to EVDD via a pull-up resistor or to GND via a pull-down resistor.

MRD, MWR

Output

Leave open.

MHOLDRQ

Input

Connect to EVDD via a pull-up resistor.

MBSTB, MHOLDAK

Output

Leave open.

MWAIT

Input

Connect to EVDD via a pull-up resistor.

TCK

Input

Connect to GND via a pull-down resistor.

TDO, TICE

Output

Leave open.

TMS, TDI

Input

Leave open (this pin is internally pulled up).

TRST

Input

Leave open (this pin is internally pulled down).

Notes 1. These pins

may

left opened if the

HCS,

HRD,and

HWR

are

fixed

the

high

level.

However, connect these pins as recommended in the HALT and STOP modes when the power

consumption must be lowered.

2. These pins may leave opened if the external data memory is not accessed in the program.

However, connect these pins as recommended in the HALT and STOP modes when the power

consumption must be lowered.

Caution Unused alternate-function pins should be handled in accordance with the processing specified

for the pin function of the initial setting.

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