ST10F273Z4 STMicroelectronics, ST10F273Z4 Datasheet - Page 152
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ST10F273Z4
Manufacturer Part Number
ST10F273Z4
Description
16-BIT MICROCONTROLLER WITH MAC UNIT, UP TO 832 KBYTES FLASH MEMORY AND UP TO 68 KBYTES RAM
Manufacturer
STMicroelectronics
Datasheet
1.ST10F273Z4.pdf
(188 pages)
Specifications of ST10F273Z4
Single Voltage Supply
5 V ±10%
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Electrical characteristics
24.8.10
Note:
152/188
Figure 44. ST10F273Z4 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 in 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).
T
±5
±4
±3
±2
±1
JIT
0
0
200
16MHz
400
24MHz
N (CPU clock periods)
600
32MHz
free
). This feature allows to recover from a
40MHz
800
1000
1200
64MHz
ST10F273Z4
1400
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