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STM8AF5268 Datasheet(PDF) 18 Page - STMicroelectronics

Part # STM8AF5268
Description  Automotive 8-bit MCU, with up to 128 Kbyte Flash, data EEPROM, 10-bit ADC, timers, LIN, CAN, USART, SPI, I2C, 3 to 5.5 V
PDF  125 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM8AF5268 Datasheet(HTML) 18 Page - STMicroelectronics

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STM8AF526x/8x/Ax STM8AF6269/8x/Ax
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DocID14395 Rev 15
5.5.3
128 kHz low-speed internal RC oscillator (LSI)
The frequency of this clock is 128 kHz and it is independent from the main clock. It drives
the independent watchdog or the AWU wakeup timer.
In systems which do not need independent clock sources for the watchdog counters, the
128 kHz signal can be used as the system clock. This configuration has to be enabled by
setting an option byte (OPT3/OPT3N, bit LSI_EN).
5.5.4
24 MHz high-speed external crystal oscillator (HSE)
The external high-speed crystal oscillator can be selected to deliver the main clock in
normal Run mode. It operates with quartz crystals and ceramic resonators.
•
Frequency range: 1 MHz to 24 MHz
•
Crystal oscillation mode: preferred fundamental
•
I/Os: standard I/O pins multiplexed with OSCIN, OSCOUT
5.5.5
External clock input
An external clock signal can be applied to the OSCIN input pin of the crystal oscillator. The
frequency range is 0 to 24 MHz.
5.5.6
Clock security system (CSS)
The clock security system protects against a system stall in case of an external crystal clock
failure.
In case of a clock failure an interrupt is generated and the high-speed internal clock (HSI) is
automatically selected with a frequency of 2 MHz (16 MHz/8).
Table 4. Peripheral clock gating bits (CLK_PCKENR1)
Control bit
Peripheral
PCKEN17
TIM1
PCKEN16
TIM3
PCKEN15
TIM2
PCKEN14
TIM4
PCKEN13
LINUART
PCKEN12
USART
PCKEN11
SPI
PCKEN10
I2C



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