ST7FOXK1 STMicroelectronics, ST7FOXK1 Datasheet - Page 62

• 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

Power saving modes
8.2
Note:
8.3
62/226
Slow mode
This mode has two targets:
Slow mode is controlled by the SMS bit in the MCCSR register which enables or disables
Slow mode.
In this mode, the oscillator frequency is divided by 32. The CPU and peripherals are clocked
at this lower frequency.
Slow-Wait mode is activated when entering Wait mode while the device is already in Slow
mode.
Figure 23. Slow mode clock transition
Wait mode
Wait mode places the MCU in a low power consumption mode by stopping the CPU.
This power saving mode is selected by calling the ‘WFI’ instruction.
All peripherals remain active. During Wait mode, the I bit of the CC register is cleared, to
enable all interrupts. All other registers and memory remain unchanged. The MCU remains
in Wait mode until an interrupt or Reset occurs, whereupon the Program Counter branches
to the starting address of the interrupt or Reset service routine.
The MCU will remain in Wait mode until a Reset or an Interrupt occurs, causing it to wake
up.
Refer to
To reduce power consumption by decreasing the internal clock in the device,
To adapt the internal clock frequency (f
Figure 24
for a description of the Wait mode flowchart.
SMS
f
CPU
f
OSC
CPU
) to the available supply voltage.
f
OSC
NORMAL RUN MODE
/32
REQUEST
ST7FOXF1, ST7FOXK1, ST7FOXK2
f
OSC