7480 datasheet(192/337 Pages) RENESAS

192 / 337 page

7480 Group and 7481 Group User's Manual

1-175

HARDWARE

1.20 Built-in PROM Version

1.20.2 Pin Descriptions

Tables 1.20.3 and 1.20.4 list pin descriptions in the Ordinary and EPROM modes.

Table 1.20.3 Pin Descriptions (1)

VCC,

VSS

AVSS

VREF

RESET

XIN

XOUT

Name

Power source

Analog

power source

Reference

voltage input

Mode input

Reset input

Clock input

Clock output

Mode

Ordinary/

EPROM

Ordinary/

EPROM

Ordinary

EPROM

Ordinary

EPROM

Ordinary/

EPROM

Ordinary/

EPROM

Input/

Output

Input

Output

Function

• Apply the following voltage to the VCC pin:

2.7 V to 4.5 V (at f(XIN) = (2.2 VCC–2) MHz), or

4.5 V to 5.5 V (at f(XIN) = 8 MHz).

• Apply 0 V to the VSS pin.

• Ground level input pin for the A-D converter

• Apply the same voltage as for the VSS pin to the AVSS

pin.

Note: This pin is dedicated to the 44P6N-A package products

in the 7481 Group.

• Reference voltage input pin for A-D converter

• Apply the following voltage to the VREF pin:

2 V to VCC when VCC = 2.7 V to 4.0 V, or

0.5 VCC to VCC when VCC = 4.0 V to 5.5 V.

Note: When not using A-D converter, connect VREF pin to

VCC.

• CE input pin

• Reset input pin

• System Reset: Holding the LOW level for 2

µs or more

forces CPU into reset state.

• Connect it to VSS pin.

• I/O pins for clock generator

• A ceramic resonator is connected between pins XIN and

XOUT.

• When an external clock is used, it is input to XIN pin, and

leave XOUT pin open.

• A feedback resistor is built in between pins XIN and XOUT.

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