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ST72324BK bảng dữ liệu(PDF) 48 Page - STMicroelectronics

tên linh kiện ST72324BK
Giải thích chi tiết về linh kiện  8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI
PDF  188 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72324BK bảng dữ liệu(HTML) 48 Page - STMicroelectronics

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Power saving modes
ST72324B
48/188
Figure 24.
Slow mode clock transitions
8.3
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 25.
Figure 25.
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.
00
01
SMS
CP1:0
fCPU
New Slow
Normal Run mode
frequency
request
request
fOSC2
fOSC2/2
fOSC2/4
fOSC2
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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