ST7FOXK1 STMicroelectronics, ST7FOXK1 Datasheet - Page 37

• Manufacturer Part Number: ST7FOXK1
• Description: Low cost flash 8bit micro
• Manufacturer: STMicroelectronics

Specifications of ST7FOXK1

• 4 To 8 Kbytes Single Voltage Extended Flash (xflash) Program Memory With Read-out Protection In-circuit Programming And In-application Programming (icp And Iap) Endurance: 1K write/erase cycles guaranteed Data retention
• Clock Sources: Internal trimmable 8 MHz RC oscillator, auto wakeup internal low power - low frequency oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-Halt, Auto Wakeup from Halt, Wait and Slow
• A/d Converter: up to 10 input channels

ST7FOXF1, ST7FOXK1, ST7FOXK2
Note:
2
3
1
Case 2 Switching from AWU RC to internal RC
1.
2.
3.
4.
5.
When the internal RC is not selected, it is stopped so as to save power consumption.
When the internal RC is selected, the AWU RC is turned on by hardware when entering
Auto wakeup from Halt mode.
When the external clock is selected, the AWU RC oscillator is always on.
Figure 11. Clock switching
Reset the RC/AWU bit to enable the internal RC oscillator
Using a 4-bit counter, wait until 8 internal RC cycles have elapsed. The counter is
running on internal RC clock.
Wait till the AWU_FLAG is cleared (1AWU RC cycle) and the RC_FLAG is set (2 RC
cycles)
The switch to the internal RC clock is made at the positive edge of the internal RC clock
signal
Once the switch is made, the AWU RC is stopped
Internal RC
AWU RC
Poll AWU_FLAG until set
Poll RC_FLAG until set
Set RC/AWU
Reset RC/AWU
Supply, reset and clock management
Internal RC
AWU RC
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