7477 datasheet(201/354 Pages) RENESAS

201 / 354 page

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

1-184

HARDWARE

1.19 Built-in PROM version

Input/

Output

Input

Input/

output

Input

Name

Input port P3

Address input

A11, A12

Mode input

VPP input

I/O port P4

Address input

A13, A14

Input port P5

Functions

• Port P3 is a 4-bit input port.

• Pins P30, P31 are in common with external in-

terrupt input pins INT0, INT1 respectively.

• Pins P32, P33 are in common with timer input

pins CNTR0, CNTR1 respectively.

• The P30 and P31 pins are the address (A11,

A12) input pins.

•

_____

The P32 pin becomes an OE input pin.

• The P33 pin is a VPP input pin and VPP is applied

to it when the VPP is input and the program is

verified.

• Port P4 is a 4-bit I/O port.

• The output structure is CMOS output.

• In input mode, pull-up transistor can be con-

nected in units of 4-bit.

Note: The 7470/7477 group has only 2 pins P40

and P41.

• The P40 to P41 pins are the address (A13, A14)

input pins.

• In the case of the 7471/7478 group, put the

P42 and P43 pins into the open state.

• 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

to P53.

• Put this port into the open state.

Mode

Ordinary

EPROM

Ordinary

EPROM

Ordinary

EPROM

Table 1.19.5 Pin description (3)

P30–P33

P40–P43

P50–P53

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