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ST7LITEUS5 Datasheet(PDF) 56 Page - STMicroelectronics

Part # ST7LITEUS5
Description  Interrupt management
PDF  136 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7LITEUS5 Datasheet(HTML) 56 Page - STMicroelectronics

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Figure 27.
AWUFH mode flowchart
1.
WDGHALT is an option bit. See option byte section for more details.
2.
Peripheral clocked with an external clock source can still be active.
3.
Only an AWUFH interrupt and some specific interrupts can exit the MCU from Halt mode (such as external
interrupt). Refer to Table 9: 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.
RESET
INTERRUPT 3)
Y
N
N
Y
CPU
MAIN OSC
PERIPHERALS 2)
I[1:0] BITS
OFF
OFF
10
OFF
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU
MAIN OSC
PERIPHERALS
I[1:0] BITS
ON
OFF
XX 4)
ON
CPU
MAIN OSC
PERIPHERALS
I[1:0] BITS
ON
ON
XX 4)
ON
64 CPU CLOCK
DELAY
WATCHDOG
ENABLE
DISABLE
WDGHALT 1)
0
WATCHDOG
RESET
1
CYCLE
AWU RC OSC
ON
AWU RC OSC
OFF
AWU RC OSC
OFF
HALT INSTRUCTION
(Active-Halt disabled)
(AWUCSR.AWUEN=1)
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