7480 datasheet(14/98 Pages) RENESAS

14 / 98 page

MITSUBISHI MICROCOMPUTERS

7480/7481 GROUP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PRELIMINAR

Notice:

This

is not

a final

specification.

Some

parametric

limits

are

subject

to change.

[Pull-up Control Registers]

Ports P0 and P1 are provided with a programmable pull-up tran-

sistor. When “1” is written to the pull-up control register and the

direction register is in the input mode, the pull-up transistor turns

on, and the port is pulled up.

s Notes on Use for STP Instruction

When the 7480/7481 group is executing an STP instruction, apply

0 V or the same voltage as Vcc to the following pins.

If an intermediate voltage is applied to these pins, a through-cur-

rent flows to the input gates and the power current increases.

P4, P5, P3, P16, P14

[Port P4P5 Input Control Register]

When ports P42, P43 and P5 of the 7481 group are selected for in-

put, clear the corresponding direction register to “0” and set “1” to

the corresponding bit of the port P4P5 input control register.

Ports P42, P43 and P5 are not included in the 7480 group. Fix

each bit of the port P4P5 input control register to “0”.

Fig. 10 Structure of pull-up control register

I/O Ports

[Direction Registers]

The I/O ports have direction registers which determine the input/

output direction of each pin in units of bit. When a bit of the direc-

tion register is set to “1”, the corresponding pin becomes an output

port. When the bit is cleared to “0”, it becomes an input port.

If data is read from a pin configured as output, the value of the

port latch is read rather than the value of this pin.

A pin configured as input becomes floating and its value can be

read. If data is written to a pin, it is written to the port latch, but the

pin remains floating.

Fig. 11 Structure of port P4P5 input control register

Port P4P5 input control register

(P4P5CON : address 00D216)

P42, P43 input control bit

P5 input control bit

(For the 7480 group) Set this bit to “0”.

(For the 7481 group) Set this bit to “1”.

Not used (“0” at read)

Port P1 pull-up control register

(P1PCON : address 00D116)

P13 – P10 pull-up control bit

P17 – P14 pull-up control bit

Port P0 pull-up control register

(P0PCON : address 00D016)

P00 pull-up control bit

P01 pull-up control bit

P02 pull-up control bit

P03 pull-up control bit

P04 pull-up control bit

P05 pull-up control bit

P06 pull-up control bit

P07 pull-up control bit

0 : Pull-up transistor OFF

1 : Pull-up transistor ON

0 : Pull-up transistor OFF

1 : Pull-up transistor ON

Not used (undefined at read)

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