Renesas Single-Chip Microcomputer M37531T-ADS Technické informace stáhnout pdf (Strana 40)

MESC TECHNICAL NEWS

No.M16C-49-0004

( 1 / 1)

GRADE

1. Affected devices

• M16C/80 Series

• M16C/60 Series

2. Cautions

When the MCU enters wait mode while operating in memory expansion mode or microprocessor

mode, a pin functioning as part of the address or data bus retains it's state on the bus

before wait mode is entered. Shift to single-chip mode and output an arbitrary value in order to

reduce current consumption. By shifting to single-chip mode, a pin which was functioning as part

of the bus becomes a general-purpose port and can output an arbitrary value. Set the port

registers and direction registers after shifting to single-chip mode (this implies that

_____ ______ _____

any control pins (CS,WR,RD,etc.. ) being used for access of an external device be

changed as well).

If the port registers and direction registers are set while in memory expansion mode or

microprocessor mode, the operation will be ignored.

This is similar when entering stop mode.

Setting procedure is following.

M16C/80 Series, M16C/60 Series

Cautions for Using Memory Expansion Mode or Microprocessor Mode

Operate in memory expansion mode or microprocessor mode

Shift to single-chip mode

Set the port register

Set the direction register

Enter the wait mode or stop mode

Note

Note:

This program does not work in external area. Transfer a program to

internal RAM and work on internal RAM.

Related to M16C/80, M16C/60 series devices.

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Renesas Single-Chip Microcomputer M37531T-ADS Technické informace Strana 40