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ST72321BXXX-AUTO Datasheet(PDF) 73 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) 73 Page - STMicroelectronics

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ST72321Bxxx-Auto
Power saving modes
73/247
Figure 28.
Halt mode flowchart
1.
WDGHALT is an option bit. See Section 21.1.1: Flash configuration for more details.
2.
Peripheral clocked with an external clock source can still be active.
3.
Only some specific interrupts can exit the MCU from Halt mode (such as external interrupt). Refer to
Table 19: Interrupt mapping for more details.
4.
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.
HALT INSTRUCTION
RESET
INTERRUPT (3)
Y
N
N
Y
CPU
OSCILLATOR
PERIPHERALS (2)
I[1:0] BITS
OFF
OFF
10
OFF
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
OFF
XX (4)
ON
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
ON
XX (4)
ON
256 OR 4096 CPU CLOCK
DELAY
WATCHDOG
ENABLE
DISABLE
WDGHALT (1)
0
WATCHDOG
RESET
1
(MCCSR.OIE = 0)
CYCLE


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