7480 datasheet(27/337 Pages) RENESAS

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7480 Group and 7481 Group User's Manual

1-10

HARDWARE

1.5 Pin Descriptions

Tables 1.5.1 and 1.5.2 list the pin descriptions.

For pin functions in the EPROM mode of the built-in PROM version, refer to Section 1.20.2 Pin Descriptions.

Table 1.5.1 Pin Descriptions (1)

1.5 Pin Descriptions

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 V when VCC = 2.7 V to 4.0 V, or

0.5 VCC (

≥ 2) to VCC V when VCC = 4.0 V to 5.5 V.

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

VCC.

• Reset input pin

• System Reset: Holding the LOW level for 2

µs or more

forces CPU into reset state.

• 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.

VCC, VSS

AVSS

VREF

RESET

XIN

XOUT

Name

Power source

Analog power source

Reference voltage input

Reset input

Clock input

Clock output

Input/

Output

Input

Output

7480 Datasheet(PDF) 27 Page - Renesas Technology Corp

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