ST7232AK2-Auto STMicroelectronics, ST7232AK2-Auto Datasheet - Page 54

• Manufacturer Part Number: ST7232AK2-Auto
• Description: 8-bit MCU for automotive, 16 Kbyte Flash, 10-bit ADC, 4 timers, SPI, SCI
• Manufacturer: STMicroelectronics

Specifications of ST7232AK2-Auto

• Hdflash Endurance: 100 cycles, data retention
• Clock Sources: crystal/ceramic resonator oscillators and bypass for external clock
• Four Power Saving Modes: halt, active halt, wait and slow
• Main Clock Controller With: real time base, beep and clock-out capabilities
• Two 16-bit Timers With: 2 input captures, 2 output compares, PWM and pulse generator modes

Power saving modes
8
8.1
8.2
Note:
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Introduction
Slow mode
Slow wait mode is activated when entering the wait mode while the device is already in slow
Power saving modes
To give a large measure of flexibility to the application in terms of power consumption, four
main power saving modes are implemented in the ST7 (see
wait), active halt and halt.
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 19. Power saving mode transitions
This mode has two targets:
●
●
Slow mode is controlled by three bits in the MCCSR register: the SMS bit which enables or
disables slow mode and two CPx bits which select the internal slow frequency (f
In this mode, the master clock frequency (f
and peripherals are clocked at this lower frequency (f
mode.
To reduce power consumption by decreasing the internal clock in the device
To adapt the internal clock frequency (f
Active halt
Slow wait
OSC2
Power consumption
CPU
Slow
Wait
Run
Halt
) to the available supply voltage
) can be divided by 2, 4, 8 or 16. The CPU
High
Low
CPU
).
Figure
OSC2
19): slow, wait (slow
).
ST7232Axx-Auto
CPU
).