TMP92CF30
2009-06-12
92CF30-33
3.4.4
Clock doubler (PLL)
PLL0 outputs the f
PLL
clock signal, which is 12 or 16 times as fast as f
OSCH
. A low-speed
frequency oscillator can be used as external oscillator, even though the internal clock is
high-frequency.
Since Reset initializes PLL0 to stop status, so setting to PLLCR0 and PLLCR1-register is
needed before use.
As with an oscillator, this circuit requires time to stabilize. This is called the lock-up time
and it is measured by a 12-stage binary counter. Lock-up time is about 0.41ms at f
OSCH
=
10MHz.
PLL (PLL1) which is special for USB is built in. Lock-up time is about 0.82ms at f
OSCH
=
10MHz measured by 13-stage binary counter.
Note1: Input frequency range for PLL
The input frequency range (High frequency oscillation) for PLL is as follows:
f
OSCH
= X to X MHz (Vcc = 1.4 to 1.6V)
Note2: PLLCR0<LUPFG>
The logic of PLLCR0<LUPFG> is different from 900/L1’s DFM.
Exercise care in determining theend of lock-up time.
Note3: PLLCR1<PLL0>, PLLCR1<PLL1>
It is not possible to turn ON both PLL0 and PLL1 simultaneously.
If turning ON simultaneously, one PLL should be turn ON after finishing the lock up of the other PLL.
shows the frequency of f
SYS
when using PLL and clock gear at f
OSCH
=
10MHz.
Table 3.4.2 The frequency of f
SYS
at f
OSCH
=
10MHz
Frequency of f
SYS
f
OSCH
f
PLL
fc fc/2 fc/4 fc/8
fc/16
f
OSCH
10MHz
10MHz 5MHz 2.5MHz
1.25MHz
625kHz
×
12 120MHz
60MHz 30MHz 15MHz 7.5MHz
3.75MHz
10MHz
×
16 160MHz
80MHz 40MHz 20MHz 10MHz 5MHz
Содержание TLCS-900/H1 Series
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