M38B53M4-059FP datasheet(242/355 Pages) MITSUBISHI

Part #	M38B53M4-059FP

Description	8-BIT SINGLE-CHIP MICROCOMPUTER

PDF	355 Pages

Scroll/Zoom	100%

Manufacturer	MITSUBISHI [Mitsubishi Electric Semiconductor]

Direct Link	http://www.mitsubishichips.com

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242 / 355 page

2-154

38B5 Group User’s Manual

APPLICATION

2.11 Clock generating circuit

Control procedure: Set the relevant registers in the order shown below to prepare for a power

failure.

Fig. 2.11.5 Control procedure

Initialization

CPUM (address 003B16), bit 6

CPUM (address 003B16), bit 4

CPUM (address 003B16), bit 7

CPUM (address 003B16), bit 5

1 (Note)

RESET

Internal system clock: f(XCIN) (low-speed mode)

Main clock f(XIN) oscillation stopped

Note: Do not switch at one time.

Return processing from power failure

Set so that timer interrupt occurs every one

second

Execute WIT instruction

At a power failure, clock count is performed during

timer interrupt processing (every second).

Port XC: XCIN-XCOUT oscillation function

When selecting main clock f(XIN) (high-speed mode)

Detect power failure ?

Return condition from power failure

concluded ?

qX: This bit is not used here. Set it to “0” or “1” arbitrarily.

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M38B53M4-059FP Datasheet(PDF) 242 Page - Mitsubishi Electric Semiconductor