st72324bk STMicroelectronics, st72324bk Datasheet - Page 42

• Manufacturer Part Number: st72324bk
• Description: 3 V/5 V Range 8-bit Mcu With 4/8 Kbyte Rom, 10-bit Adc, Four Timers And Spi
• Manufacturer: STMicroelectronics

Power saving modes
7.3
42/167
Figure 19. Slow mode clock transitions
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[1:0] bits of the CC register are forced
to ‘10’, 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
Figure
20.
CP1:0
SMS
f
CPU
f
OSC2
f
00
OSC2
frequency
New slow
request
/2
01
f
OSC2
Normal Run mode
/4
request
f
OSC2
ST72323 ST72323L