7477 datasheet(32/354 Pages) RENESAS

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

HARDWARE

1.5 Pin description

1-15

Table 1.5.2 Pin description (2)

Name

I/O port P1

I/O port P2

(7470/7471 group)

Input port P2

(7477/7478 group)

Input port P3

I/O port P4

Functions

• Port P1 is an 8-bit I/O port.

• The output structure is CMOS output.

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

in units of 4-bit.

• Pins P12 and P13 are in common with timer out-

put pins T0, T1 respectively.

• In the case of the 7470/7471 group, P14–P17 are

in common with serial I/O pins SIN, SOUT, CLK,

__________

SRDY

respectirely.

• In the case of the 7470/7471 group, the outputs

__________

of pins SOUT and the SRDY can be N-channel open

drain outputs.

• In the case of the 7477/7478 group, P14–P17 are

in common with serial I/O pins RXD, TXD, SCLK,

__________

SRDY,

respectively.

• Port P2 is an 8-bit I/O port.

• The output structure is CMOS output.

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

in units of 4-bit.

• Pins P20–P27 are in common with analog input

pins IN0–IN7 respectively.

Note: The 7470 group has only the 4 pins P20–P23

(IN0–IN3).

• Port P2 is an 8-bit input port.

• It is impossible to connect a pull-up transistor.

• Pins P20–P27 are in common with analog lnput

pins IN0–IN7 respectively.

Note: The 7477 group has only the 4 pins P20–P23

(IN0–IN3).

• Port P3 is a 4-bit input port.

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

rupt input pins INT0, INT1 respectively.

• Pins P32, P33 are in common with timer input pins

CNTR0, CNTR1 respectively.

• Port P4 is a 4-bit I/O port.

• The output structure is CMOS output.

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

in units of 4-bit.

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

and P41.

Input/

Output

I/O

Input

I/O

P10–P17

P20–P27

P30–P33

P40–P43

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