Toshiba TLCS-900/H1 Series Manual page 31
Original cmos 32-bit microcontroller
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Limitations on the use of PLL
1.
It is not possible to execute PLL enable/disable control in the SLOW mode (fs)
(writing to PLLCR0 and PLLCR1).
PLL should be controlled in the NORMAL mode.
2. When stopping PLL operation during PLL use, execute the following settings in the
same order.
LD
(PLLCR0), 00H
LD
(PLLCR1), 00H
3.
When stopping the high-frequency oscillator during PLL use, stop PLL before stopping
the high-frequency oscillator.
Examples of settings are shown below:
(1) Start up/change control
(OK) Low-frequency oscillator operation mode (fs) (high-frequency oscillator STOP)
→ High-frequency oscillator start up → High-frequency oscillator operation
mode (f
OSCH
LD
(SYSCR0),
WUP:
BIT
2, (SYSCR0)
JR
NZ, WUP
LD
(SYSCR1),
LD
(PLLCR1),
LUP:
BIT
5, (PLLCR0)
JR
Z, LUP
LD
(PLLCR0),
(OK) Low-frequency oscillator operation mode (fs) (high-frequency oscillator
Operate) → High-frequency oscillator operation mode (f
→ PLL use mode (f
LD
(SYSCR1),
LD
(PLLCR1),
LUP:
BIT
5, (PLLCR0)
JR
Z, LUP
LD
(PLLCR0),
(Error) Low-frequency oscillator operation mode (fs) (high-frequency oscillator
STOP) → High-frequency oscillator start up → PLL start up → PLL use
mode (f
LD
(SYSCR0),
WUP:
BIT
2, (SYSCR0)
JR
NZ, WUP
LD
(PLLCR1),
LUP:
BIT
5, (PLLCR0)
JR
Z, LUP
LD
(PLLCR0),
LD
(SYSCR1),
;
Change the clock f
;
PLL stop
) → PLL start up → PLL use mode (f
1 1 − − − 1 − − B ;
;
;
− − − − 0 − − − B ;
1 − − − − − − − B ;
;
;
− 1 − − − − − − B ;
)
PLL
− − − − 0 − − − B ;
1 − − − − − − − B ;
− 1 − − − − − − B ;
)
PLL
1 1 − − − 1 − − B ;
1 − − − − − − − B ;
− 1 − − − − − − B ;
− − − − 0 − − − B ;
92CH21-29
to f
PLL
OSCH
)
PLL
High-frequency oscillator start/warm-up start
Check for warm-up end flag
Change the system clock fs to f
PLL start-up/lock up start
Check for lock up end flag
Change the system clock f
Change the system clock fs to f
PLL start-up/lock up start
;
Check for lock up end flag
;
Change the system clock f
High-frequency oscillator start/warm-up start
;
Check for warm-up end flag
;
PLL start-up/lock up start
;
Check for lock up end flag
;
Change the internal clock f
Change the system clock fs to f
TMP92CH21
OSCH
to f
OSCH
PLL
) → PLL start up
OSCH
OSCH
to f
OSCH
PLL
to f
OSCH
PLL
PLL
2009-06-19
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