M30620FCAFP datasheet(535/615 Pages) RENESAS

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Controlling Power Applications

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-218

Figure 3.8.3. Set-up procedure of controlling power using wait mode (2)

Canceling protect

Protect register [Address 000A 16]

PRCR

Enables writing to system clock control registers 0 and 1 (address 0006 16 and 000716)

1 : write-enabled

Switching system clock

System clock select bit

1 : XCIN-XCOUT

System clock control register 0 [Address 0006 16]

CM0

Main clock (XIN-XOUT) stop bit

1 : Off

System clock control register 0 [Address 0006 16]

CM0

Stopping main clock

[F_WIT] = 1

WAIT instruction

Main clock (XIN-XOUT) stop bit

0 : On

System clock control register 0 [Address 0006 16]

CM0

Starting main clock oscillator

[F_WIT] : 1

≠

TB2 interrupt request generated

INT0 interrupt request generated

NOP instruction X 4

Continued from the previous page

Interrupt enable flag (I flag)

“1”

Switching system clock

System clock select bit

0 : XIN-XOUT

System clock control register 0 [Address 0006 16]

CM0

Wait until the main clock has stabilized

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