STM8AL3136 datasheet(18/124 Pages) STMICROELECTRONICS

18 / 124 page

Functional overview

STM8AL313x/4x/6x STM8AL3L4x/6x

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DocID18474 Rev 7

Figure 2. Medium-density STM8AL313x/4x/6x and STM8AL3L4x/6x clock tree diagram

1. The HSE clock source can be either an external crystal/ceramic resonator or an external source (HSE

bypass). Refer to Section HSE clock in STM8L051/L052 Value Line, STM8L151/L152, STM8L162,

STM8AL31, STM8AL3L MCU lines reference manual (RM0031).

2. The LSE clock source can be either an external crystal/ceramic resonator or a external source (LSE

bypass). Refer to Section LSE clock in STM8L051/L052 Value Line, STM8L151/L152, STM8L162,

STM8AL31, STM8AL3L MCU lines reference manual (RM0031).

3.5

Low power real-time clock

The real-time clock (RTC) is an independent binary coded decimal (BCD) timer/counter.

Six byte locations contain the second, minute, hour (12/24 hour), week day, date, month,

year, in BCD (binary coded decimal) format. Correction for 28, 29 (leap year), 30, and 31

day months are made automatically.

It provides a programmable alarm and programmable periodic interrupts with wakeup from

Halt capability.

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Periodic wakeup time using the 32.768 kHz LSE with the lowest resolution (of 61 µs) is

from min. 122 µs to max. 3.9 s. With a different resolution, the wakeup time can reach

36 hours.

•

Periodic alarms based on the calendar can also be generated from every second to

every year.

STM8AL3136 数据表(PDF) 18 Page - STMicroelectronics