ST7FLITEU05B3 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7FLITEU05B3

8-bit MCU with single voltage Flash memory, ADC, timers

STMicroelectronics 

ST7LITEU05 ST7LITEU09

SUPPLY, RESET AND CLOCK MANAGEMENT (Cont’d)

– 2. Using a 4-bit counter, wait until 8 internal RC

cycles have elapsed. The counter is running on

internal RC clock.

– 3. Wait till the AWU_FLAG is cleared (1AWU RC

cycle) and the RC_FLAG is set (2 RC cycles)

– 4. The switch to the internal RC clock is made at

the positive edge of the internal RC clock signal

3. When the external clock is selected, the AWU

RC oscillator is always on.

Figure 13. Clock Switching

Internal RC Set RC/AWU

AWU RC

Poll AWU_FLAG until set

– 5. Once the switch is made, the AWU RC is

stopped

Notes:

1. When the internal RC is not selected, it is

stopped so as to save power consumption.

AWU RC

Reset RC/AWU

Internal RC

Poll RC_FLAG until set

2. When the internal RC is selected, the AWU RC

is turned on by hardware when entering Auto

Wake-Up from Halt mode.

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