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ST7L19 bảng dữ liệu(PDF) 36 Page - STMicroelectronics

tên linh kiện ST7L19
Giải thích chi tiết về linh kiện  8-bit MCU for automotive with single voltage Flash/ROM memory, data EEPROM, ADC, 5 timers, SPI
PDF  138 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST7L19 bảng dữ liệu(HTML) 36 Page - STMicroelectronics

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POWER SAVING MODES (cont’d)
9.3 WAIT MODE
WAIT mode places the MCU into a low power con-
sumption 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 bit of the CC register is cleared to enable all
interrupts. All other registers and memory remain
unchanged. The MCU remains in WAIT mode until
an interrupt or reset occurs, whereupon it wakes
up and the Program Counter branches to the start-
ing address of the interrupt or reset service rou-
tine.
Refer to Figure 21.
Figure 21. WAIT Mode Flowchart
Notes:
1. Before servicing an interrupt, the CC register is pushed
on the stack. The I bit of the CC register is set during the
interrupt routine and cleared when the CC register is
popped.
WFI INSTRUCTION
RESET
INTERRUPT
Y
N
N
Y
CPU
OSCILLATOR
PERIPHERALS
IBIT
ON
ON
0
OFF
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU
OSCILLATOR
PERIPHERALS
IBIT
ON
OFF
0
ON
CPU
OSCILLATOR
PERIPHERALS
IBIT
ON
ON
X1)
ON
CYCLE DELAY
256 OR 4096 CPU CLOCK
1



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