7477 datasheet(33/354 Pages) RENESAS

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7477 Datasheet(PDF) 33 Page - Renesas Technology Corp

Part #	7477

Description	8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES

PDF	354 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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33 / 354 page

HARDWARE

1.5 Pin description

7470/7471/7477/7478 GROUP USER’S MANUAL

1-16

Table 1.5.3 Pin description (3)

Name

Input port P5

P50–P53

Input/

Output

Input

Functions

• Port P5 is a 4-bit input port.

• Pull-up transistor can be connected in units of

4-bit.

• Pins P50, P51 are in common with input/output

pins for sub-clock generating circuit XCIN, XCOUT

respectively.

• When using pins P50 and P51 as pins XCIN and

XCOUT, connect a quartz-crystal oscillator between

pins XCIN and XCOUT.

• When using pins P50 and P51 as pins XCIN and

XCOUT, a feedback resistor is connected between

pins XCIN and XCOUT.

• To use an external clock input, connect the clock

oscillation source to the XCIN pin and leave the

XCOUT pin open.

Note: Only the 7471/7478 group has pins P50–P53.

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