7477 datasheet(200/354 Pages) RENESAS

200 / 354 page

1-183

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

HARDWARE

1.19 Built-in PROM version

Input/

Output

Input/

output

Input

Input/

output

Input

Name

I/O port P1

Address input

A4–A10

I/O port P2

(7470/7471

group)

Input port P2

(7477/7478

group)

Address input

A0–A3

Functions

• Port P1 is an 8-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.

• Pins P12 and P13 are in common with timer

output 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 respectively.

• In the case of the 7470/7471 group, the out-

_________

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

open drain outputs.

• In the case of the 7477/7478 group, pins

P14 – P17 are in common with serial I/O pins

_________

RXD, TXD, SCLK, SRDY, respectively.

• The P11–P17 pins are address (A4 – A10) input

pins. Put P10 into the open state.

• Port P2 is an 8-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.

• 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 input

pins IN0–IN7 respectively.

Note: The 7477 group has only the 4 pins

P20–P23 (IN0–IN3) are available.

• The P20 to P23 pins are address (A0–A3) input

pins.

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

P24–P27 pins into the open state.

Mode

Ordinary

EPROM

Ordinary

EPROM

Table 1.19.4 Pin description (2)

P10–P17

P20–P27

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