STM8AF6268ITAY datasheet(19/99 Pages) STMICROELECTRONICS

19 / 99 page

DocID14952 Rev 11

19/99

STM8AF6246/48/66/68

Product overview

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

16 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 16 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 16 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 2. Peripheral clock gating bit assignments in CLK_PCKENR1/2 registers

Bit

Periphera

l clock

Bit

Peripheral

clock

Bit

Peripheral

clock

Bit

Peripheral

clock

PCKEN17

TIM1

PCKEN13

LINUART

PCKEN27

Reserved

PCKEN23

ADC

PCKEN16

TIM3

PCKEN12

Reserved

PCKEN26

Reserved

PCKEN22

AWU

PCKEN15

TIM2

PCKEN11

SPI

PCKEN25

Reserved

PCKEN21

Reserved

PCKEN14

TIM4

PCKEN10

I2C

PCKEN24

Reserved

PCKEN20

Reserved

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