M16C62_M Datasheet, PDF (535/615 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

Controlling Power Applications
Mitsubishi microcomputers
M16C / 62A Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Continued from the previous page
Canceling protect
b7
b0 _{Protect register [Address 000A 16]}
1 _PRCR
Enables writing to system clock control registers 0 and 1 (address 0006 16 and 000716)
1 : write-enabled
Switching system clock
b7
b0
1
System clock control register 0 [Address 0006 16]
CM0
System clock select bit
1 : XCIN-XCOUT
Stopping main clock
b7
1
b0
System clock control register 0 [Address 0006 16]
CM0
Main clock (XIN-XOUT) stop bit
1 : Off
[F_WIT] = 1
Interrupt enable flag (I flag) “1”
WAIT instruction
NOP instruction X 4
=
[F_WIT] : 1
≠
Starting main clock oscillator
b7
0
b0
System clock control register 0 [Address 0006 16]
CM0
Main clock (XIN-XOUT) stop bit
0 : On
INT0 interrupt request generated
TB2 interrupt request generated
Wait until the main clock has stabilized
Switching system clock
b7
b0
0
System clock control register 0 [Address 0006 16]
CM0
System clock select bit
0 : XIN-XOUT
Figure 3.8.3. Set-up procedure of controlling power using wait mode (2)
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