st10f273m STMicroelectronics, st10f273m Datasheet - Page 153

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st10f273m

Manufacturer Part Number
st10f273m
Description
16-bit Mcu With 512 Kbyte Flash Memory And 36 Kbyte Ram
Manufacturer
STMicroelectronics
Datasheet

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ST10F273M
24.8.10
Note:
Figure 47. ST10F273M PLL jitter
PLL lock / unlock
During normal operation, if the PLL gets unlocked for any reason, an interrupt request to the
CPU is generated, and the reference clock (oscillator) is automatically disconnected from
the PLL input: in this way, the PLL goes into free-running mode, providing the system with a
backup clock signal (free running frequency f
crystal failure occurrence without risking to go into an undefined configuration: The system
is provided with a clock allowing the execution of the PLL unlock interrupt routine in a safe
mode.
The path between reference clock and PLL input can be restored only by a hardware reset,
or by a bidirectional software or watchdog reset event that forces the RSTIN pin low.
The external RC circuit on RSTIN pin shall be properly sized in order to extend the duration
of the low pulse to grant the PLL gets locked before the level at RSTIN pin is recognized
high: bidirectional reset internally drives RSTIN pin low for just 1024 TCL (definitively not
sufficient to get the PLL locked starting from free-running mode).
Table 64.
T
T
T
Symbol
PSUP
LOCK
JIT
T
±5
±4
±3
±2
±1
JIT
PLL start-up time
PLL lock-in time
Single period jitter
(cycle to cycle = 2 TCL)
0
0
PLL characteristics (V
Parameter
200
(1)
16MHz
(1)
400
24MHz
Stable V
Stable V
starting from free-running mode
6 sigma time period variation
(peak to peak)
DD
N (CPU clock periods)
= 5V ± 10%, V
600
32MHz
DD
DD
free
Conditions
and reference clock
and reference clock,
). This feature allows to recover from a
40MHz
800
SS
= 0V, T
1000
A
Electrical characteristics
= -40°C to +125°C)
-500
Min
1200
Value
64MHz
+500
Max
300
250
1400
153/182
Unit
µs
ps

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