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TMP92CM22
2007-02-16
92CM22-18
Example 2: PLL stopping
PLLCR EQU 10E8H
LD (PLLCR), 10XXXXXXB ; Changes fc from 40 MHz to10 MHz.
LD (PLLCR), 00XXXXXXB ; Stop PLL.
X: Don’t care
Limitation point on the use of PLL
1. When PLL is started, don’t set fc from f
OSCH
to f
PLL
at same time.
Don’t setting:
LD (PLLCR), 00H
LD (PLLCR), C0H
2. When PLL is started, don’t set fc from f
OSCH
to f
PLL
at same time.
Don’t setting:
LD (PLLCR), C0H
LD (PLLCR), 00H
Changes from 40 MHz to 10 MHz.
<FCSEL>
<PLLON>
PLL output: f
PLL
System clock f
SYS
Stops PLL
operation.