ST7DALIF2 STMicroelectronics, ST7DALIF2 Datasheet - Page 50

• Manufacturer Part Number: ST7DALIF2
• Description: 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI
• Manufacturer: STMicroelectronics

Specifications of ST7DALIF2

• 8 Kbytes Single Voltage Flash Program Memory With Read-out Protection, In-circuit Programming And In-application Programming (icp And Iap). 10k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C.
• 256 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C.
• Clock Sources: Internal 1% RC oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-Halt, Wait and Slow, Auto Wake Up From Halt

Power saving modes
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Power saving modes
Introduction
To give a large measure of flexibility to the application in terms of power consumption, five
main power saving modes are implemented in the ST7 (see
■
■
■
■
■
After a RESET the normal operating mode is selected by default (RUN mode). This mode
drives the device (CPU and embedded peripherals) by means of a master clock which is
based on the main oscillator frequency divided or multiplied by 2 (f
From RUN mode, the different power saving modes may be selected by setting the relevant
register bits or by calling the specific ST7 software instruction whose action depends on the
oscillator status.
Figure 20. Power saving mode transitions
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.
Slow
Wait (and Slow-Wait)
Active-halt
Auto Wake up From Halt (AWUFH)
Halt
To reduce power consumption by decreasing the internal clock in the device,
To adapt the internal clock frequency (f
AUTO WAKE UP FROM Halt
POWER CONSUMPTION
CPU
Active-halt
Slow Wait
Halt
) to the available supply voltage.
RUN
Slow
Wait
Low
High
Figure
OSC2
20):
).
ST7DALIF2