ST72325S4 STMicroelectronics, ST72325S4 Datasheet - Page 150

• Manufacturer Part Number: ST72325S4
• Description: 8-BIT MCU WITH 16 TO 60K FLASH/ROM, ADC, CSS, FIVE TIMERS, SPI, SCI, I2C INTERFACE
• Manufacturer: STMicroelectronics

Specifications of ST72325S4

• Hdflash Endurance: 100 cycles, data retention
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
• Four Power Saving Modes: Halt, Active-Halt,Wait and Slow
• Main Clock Controller With: Real time base, Beep and Clock-out capabilities
• Two 16-bit Timers With: 2 input captures, 2 output compares, external clock input on one timer, PWM and pulse generator modes
• 8-bit Pwm Auto-reload Timer With: 2 input captures, 4 PWM outputs, output compare and time base interrupt, external clock with event detector

ST72325xx
CLOCK AND TIMING CHARACTERISTICS (Cont’d)
12.5.3 Crystal and Ceramic Resonator Oscillators
The ST7 internal clock can be supplied with four
different Crystal/Ceramic resonator oscillators. All
the information given in this paragraph is based on
characterization results with specified typical ex-
ternal components. In the application, the resona-
tor and the load capacitors have to be placed as
Notes:
1. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small R
Refer to crystal/ceramic resonator manufacturer for more details.
2. Data based on characterisation results, not tested in production.
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f
R
C
C
i
2
OSC
Symbol
Symbol
F
L1
L2
Oscillator Frequency
Feedback resistor
Recommended load capacitance ver-
sus equivalent serial resistance of the
crystal or ceramic resonator (R
OSC2 driving current
Parameter
Parameter
2)
1)
V
f
f
f
f
OSC
OSC
OSC
OSC
DD
S
)
3)
=5V:
= 2MHz, C0 = 6pF, Cl1 = Cl2 = 68pF
= 4MHz, C0 = 6pF, Cl1 = Cl2 = 68pF
= 8MHz, C0 = 6pF, Cl1 = Cl2 = 40pF
= 16MHz, C0 = 7pF, Cl1 = Cl2 = 20pF
f
f
f
f
OSC
OSC
OSC
OSC
= 1 to 2 MHz
= 2 to 4 MHz
= 4 to 8 MHz
= 8 to 16 MHz
Conditions
close as possible to the oscillator pins in order to
minimize output distortion and start-up stabiliza-
tion time. Refer to the crystal/ceramic resonator
manufacturer for more details (frequency, pack-
age, accuracy...).
Conditions
Min
Typ
20
20
20
15
15
426
425
456
660
1
Max
Max
16
40
60
50
35
35
S
MHz
Unit
Unit
kΩ
pF
µA
value.