ST72361K6 STMicroelectronics, ST72361K6 Datasheet - Page 21

• Manufacturer Part Number: ST72361K6
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST72361K6

• Hdflash Endurance: 100 cycles, data retention 40 years at 85°C
• 5 Power Saving Modes: Halt, Auto Wake Up From Halt, Active Halt, Wait and Slow

6.2 MULTI-OSCILLATOR (MO)
The main clock of the ST7 can be generated by
two different source types coming from the multi-
oscillator block:
■
■
Each oscillator is optimized for a given frequency
range in terms of consumption and is selectable
through the option byte. The associated hardware
configuration are shown in
electrical characteristics section for more details.
Caution: The OSC1 and/or OSC2 pins must not
be left unconnected. For the purposes of Failure
Mode and Effect Analysis, it should be noted that if
the OSC1 and/or OSC2 pins are left unconnected,
the ST7 main oscillator may start and, in this con-
figuration, could generate an f
in excess of the allowed maximum (> 16 MHz),
putting the ST7 in an unsafe/undefined state. The
product behavior must therefore be considered
undefined when the OSC pins are left unconnect-
ed.
External Clock Source
In external clock mode, a clock signal (square, si-
nus or triangle) with ~50% duty cycle has to drive
the OSC1 pin while the OSC2 pin is tied to ground.
Crystal/Ceramic Oscillators
This family of oscillators has the advantage of pro-
ducing a very accurate rate on the main clock of
the ST7. The selection within a list of five oscilla-
tors with different frequency ranges must be done
by option byte in order to reduce consumption (re-
fer to
an external source
a crystal or ceramic resonator oscillator
Section 14.1 on page 210
Table
OSC
for more details on
clock frequency
6. Refer to the
the frequency ranges). The resonator and the load
capacitors must be placed as close as possible to
the oscillator pins in order to minimize output dis-
tortion and start-up stabilization time. The loading
capacitance values must be adjusted according to
the selected oscillator.
These oscillators are not stopped during the
RESET phase to avoid losing time in the oscillator
start-up phase.
Table 6. ST7 Clock Sources
C
L1
Hardware Configuration
EXTERNAL
SOURCE
OSC1
OSC1
CAPACITORS
LOAD
ST7
ST7
OSC2
OSC2
C
ST72361
L2
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