ST7FLITE39F2M3TR STMicroelectronics, ST7FLITE39F2M3TR Datasheet - Page 39

• Manufacturer Part Number: ST7FLITE39F2M3TR
• Description: IC MCU 8BIT 8K FLASH 20SOIC
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST7FLITE39F2M3TR

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: LINSCI, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 15
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 7x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-SOIC (7.5mm Width)
• For Use With: 497-8406 - BOARD STF20NM50FD/STF7LITE39BF2497-8403 - BOARD DEMO STCC08 AC SW DETECTOR497-5858 - EVAL BOARD PLAYBACK ST7FLITE497-5049 - KIT STARTER RAISONANCE ST7FLITE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9 POWER SAVING MODES
9.1 INTRODUCTION
To give a large measure of flexibility to the applica-
tion in terms of power consumption, five main pow-
er saving modes are implemented in the ST7 (see
Figure
■
■
■
■
■
After a RESET the normal operating mode is se-
lected 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 21. Power Saving Mode Transitions
OSC2
AUTO WAKE UP FROM HALT
Slow
Wait (and Slow-Wait)
Active Halt
Auto Wake up From Halt (AWUFH)
Halt
).
21):
ACTIVE HALT
SLOW WAIT
POWER CONSUMPTION
SLOW
WAIT
HALT
RUN
Low
High
9.2 SLOW MODE
This mode has two targets:
– To reduce power consumption by decreasing the
– To adapt the internal clock frequency (f
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.
Note: SLOW-WAIT mode is activated when enter-
ing WAIT mode while the device is already in
SLOW mode.
Figure 22. SLOW Mode Clock Transition
internal clock in the device,
the available supply voltage.
f
SMS
CPU
f
OSC
f
OSC
NORMAL RUN MODE
/32
REQUEST
ST7LITE3xF2
f
OSC
CPU
39/173
) to
1