M30620FCAFP datasheet(500/615 Pages) RENESAS

500 / 615 page

Programmable I/O Ports

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-183

Table 2.16.3. Examples of working on unused pins in memory expansion mode or microprocessor mode

(b) Memory expansion mode, microprocessor mode

Pin name

Connection

Ports P6 to P10 (excluding P85) After setting for input mode, connect every pin to VSS or VCC via a

resistor; or after setting for output mode, leave these pins open.

(Note 1, Note 2, Note 5)

AVSS, VREF

AVCC

Open (Note 3)

Connect to VCC

Connect to VSS

BHE, ALE, HLDA

Connect via resistor to VCC (pull-up)

XOUT (Note 4), BCLK (Note 6)

Open

If setting these pins in output mode and opening them, ports are in input mode until switched into

output mode by use of software after reset. Thus the voltage levels of the pins become unstable,

and there can be instances in which the power source current increases while the ports are in

input mode.

In view of an instance in which the contents of the direction registers change due to a runaway

generated by noise or other causes, setting the contents of the direction registers periodically by

use of software increases program reliability.

Make wiring as short as possible (not more than 2 cm from the microcomputer's pins) in working

on non-used pins.

When a VSS level is connected to the CNVSS pin, these pins are input ports until the processor

mode is switched by use of software after reset. Thus the voltage levels of the pins destabilize,

and there can be an increase in the power source current while these pins are input ports.

When an external clock is input to the XIN pin.

Output "L" if port P70 and P71 are set to output mode.

Port P70 and P71 are N channel open drain output.

When the BCLK output disable bit (bit 7 at address 000416) is set to “1”, connect to VCC via a

resistor (pull-up).

Note 1:

Note 2:

Note 3:

Note 4:

Note 5:

Note 6:

HOLD, RDY, NMI

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