7733 datasheet(640/940 Pages) RENESAS

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OVERVIEW

1–8

7735 Group User’s Manual

(3) In microprocessor mode

Table 1.3.6 Examples of handling unused pins in microprocessor mode

Handling example

Connect these pins to pin Vcc or Vss via resistors after these

pins are set to the input mode, or leave these pins after they are

set to the output mode (Notes 1 and 2).

Leave these pins open. (Note 3)

Leave this pin open.

Connect these pins to pin Vcc via resistors after these pins are

set to the input mode. (These pins are pulled high.) (Note 2)

Connect this pin to pin Vcc.

Connect these pins to pin Vss.

Pins

P43–P47, P5–P8

_________

________

WEH

, WEL, RDE

_____

_______

___________

HLDA

φ1, CS0–CS4, RSMP

XOUT (Note 4)

_____

____

HOLD

, RDY

AVCC

AVSS, VREF

Notes 1: When leaving these pins open after they are set to the output mode, note the following: these pins

function as input ports from reset until they are switched to the output mode by software. Therefore,

voltage levels of these pins are undefined and the power source current may increase while these

pins function as input ports.

Software reliability can be enhanced when the contents of the above ports’ direction registers are

set periodically. This is because these contents may be changed by noise, a program runaway

which occurs owing to noise, etc.

2: For unused pins, use the shortest possible wiring (within 20 mm from the microcomputer’s pins).

3: When Vss level is applied to pin CNVss, note the following: these pins function as input ports from

reset until the processor mode is switched to the microprocessor mode by software. Therefore,

voltage levels of these pins are undefined and the power source current may increase while these

pins function as input ports.

4: This is applied when an external clock is input to pin XIN.

Fig. 1.3.3 Examples of handling unused pins in microprocessor mode

P43–P47, P5–P8

RSMP

HOLD

RDY

WEH

WEL

RDE

HLDA

Vcc

Vss

AVcc

XOUT

CS0

–CS4

P43–P47, P5–P8

RSMP

HOLD

RDY

Vss

AVcc

XOUT

CS0

–CS4

Vcc

When setting ports to input mode

When setting ports to output mode

Left open

AVss

VREF

AVss

VREF

WEH

WEL

RDE

HLDA

1.3 Pin description

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