7480 datasheet(250/337 Pages) RENESAS

Il numero della parte	7480

Spiegazioni elettronici	8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES

PDF	337 Pages

Scroll/Zoom	100%

Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

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250 / 337 page

7480 Group and 7481 Group User's Manual

2-35

APPLICATIONS

2.7 Power-Saving Function

Figure 2.7.3 Control Procedure Example of Power-Saving in Key-Input Waiting State

Initialize

Set STP instruction operation control register

(Writing 2 times)

STPCON (Address 00DE16)

Writing ‘1’

RESET(Note)

CLI

Key-on wakeup interrupt service routine

Processing

RTI

Key input ?

Specified period elapsed ?

Key-on wakeup interrupt request bit

← 0

STP instruction execution

STPCON (Address 00DE16)

STP/WIT instruction valid

Key-on wakeup interrupt enable bit

← 1

Other interrupt enable bits

← 0

The interrupt enable bit and timer 1 are

returned to the state before the STP

instruction is executed.

System is returned to normal mode after the

oscillation strat-up stabilization time elapsed.

1st writing

2nd writing

Processing

Stop mode

Key input

SEI

Note: State after system is released from reset

• STP/WIT instructions invalid.

Set edge polarity selection register

EG (Address 00D416)

Port P00 is pulled high.

Key-on wakeup

Port P00 is set to input.

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