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ST72321BXXX-AUTO Datasheet(PDF) 69 Page - STMicroelectronics

Part # ST72321BXXX-AUTO
Description  8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72321BXXX-AUTO Datasheet(HTML) 69 Page - STMicroelectronics

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ST72321Bxxx-Auto
Power saving modes
69/247
Figure 24.
Wait mode flowchart
1.
Before servicing an interrupt, the CC register is pushed on the stack. The I[1:0] bits of the CC register are
set to the current software priority level of the interrupt routine and recovered when the CC register is
popped.
8.4
Active Halt and Halt modes
Active Halt and Halt modes are the two lowest power consumption modes of the MCU. They
are both entered by executing the ‘HALT’ instruction. The decision to enter either in Active
Halt or Halt mode is given by the MCC/RTC interrupt enable flag (OIE bit in MCCSR
register) as shown in Table 26.
WFI INSTRUCTION
RESET
INTERRUPT
Y
N
N
Y
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
ON
10
OFF
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
OFF
10
ON
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
ON
XX(1)
ON
256 OR 4096 CPU CLOCK
CYCLE DELAY


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