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TMP92CZ26A
92CZ26A-30
Limitation point on the use of PLL0
1. If you stop PLL operation during using PLL0, you should execute following setting in
the same order.
LD (PLLCR0),X0XXXXXXB ;
Change the clock f
PLL
to f
OSCH
LD (PLLCR1),0XXXXXXXB ; Stop PLL0
X: Don't care
2. If you shift to STOP mode during using PLL, you should execute following setting in the
same order.
LD (SYSCR2), XXXX01XXB ;
Set the STOP mode
LD (PLLCR0), X0XXXXXXB ;
Change the system clock f
PLL
to f
OSCH
LD (PLLCR1), 0XXXXXXXB ; Stop PLL0
HALT ; Shift to STOP mode
X: Don't care
Examples of settings are below;
(1) Start Up / Change Control
(OK) High frequency oscillator operation mode(f
OSCH
) PLL0 start up
PLL0 use mode (f
PLL
)
LD (PLLCR1), 1XXXXXXXB ; PLL0 start up / lock up start
LUP: BIT 5,(PLLCR0) ;
JR Z,LUP ; Check for the flag of lock up end
LD (PLLCR0), X1XXXXXXB ; Change the system clock fOSCH to fPLL
X: Don't care
(2) Change / Stop Control
(OK) PLL0 use mode (f
PLL
) High frequency oscillator operation mode(f
OSCH
)
PLL0 Stop
LD (PLLCR0),X0XXXXXXB ; Change the system clock fPLL to fOSCH
LD (PLLCR1),0XXXXXXXB ; Stop PLL0
X: Don't care
(OK) PLL0 use mode (f
PLL
) Set the STOP mode
High frequency oscillator operation mode (f
OSCH
) PLL stop
HALT(High frequency oscillator stop)
LD (SYSCR2),XXXX01XXB ; Set the STOP mode
(This command can be executed before use of PLL0)
LD (PLLCR0),X0XXXXXXB ;
Change the system clock f
PLL
to f
OSCH
LD (PLLCR1),0XXXXXXXB ; Stop PLL0
HALT ; Shift to STOP mode
X: Don't care
(NG) PLL0 use mode (f
PLL
) Set the STOP mode
HALT(High frequency oscillator stop)
LD (SYSCR2),XXXX01XXB ; Set the STOP mode
(This command can be executed before use of PLL0)
HALT ; Shift to STOP mode
X: Don't care