STEVAL-ISQ002V1 STMicroelectronics, STEVAL-ISQ002V1 Datasheet - Page 33
STEVAL-ISQ002V1
Manufacturer Part Number
STEVAL-ISQ002V1
Description
BOARD EVAL BASED ON ST72264G1
Manufacturer
STMicroelectronics
Specifications of STEVAL-ISQ002V1
Main Purpose
Interface, PMBus
Embedded
Yes, MCU, 8-Bit
Utilized Ic / Part
ST72F264
Primary Attributes
The PMBus™ Interface Using the ST7 I2C Peripheral
Secondary Attributes
Firmware in C Language
Product
Power Management Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-6423
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Quantity
Price
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Part Number:
STEVAL-ISQ002V1
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8 POWER SAVING MODES
8.1 INTRODUCTION
To give a large measure of flexibility to the applica-
tion in terms of power consumption, three main
power saving modes are implemented in the ST7
(see
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 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
Figure
20).
SLOW WAIT
POWER CONSUMPTION
SLOW
HALT
WAIT
RUN
Low
High
CPU
).
8.2 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 three bits in the
MISR1 register: the SMS bit which enables or dis-
ables Slow mode and two CPx bits which select
the internal slow frequency (f
In this mode, the oscillator frequency can be divid-
ed by 4, 8, 16 or 32 instead of 2 in normal operat-
ing mode. The CPU and peripherals are clocked at
this lower frequency.
Note: SLOW-WAIT mode is activated when enter-
ring the WAIT mode while the device is already in
SLOW mode.
Figure 21. SLOW Mode Clock Transitions
internal clock in the device,
the available supply voltage.
ST72260Gx, ST72262Gx, ST72264Gx
CP1:0
SMS
f
CPU
f
OSC2
f
FREQUENCY
OSC2
00
NEW SLOW
REQUEST
/2
01
CPU
f
OSC2
NORMAL RUN MODE
).
/4
REQUEST
CPU
f
OSC2
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