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參數(shù)資料
| 型號： | ST72331 |
| 廠商： | 意法半導體 |
| 英文描述： | 8-Bit MCU with 8 to 16K ROM/OTP/EPROM, 256 EEPROM, 384 to 512 Bytes RAM, ADC, WDG, SCI, SPI and 2 Timers(8位微控制器(8M)) |
| 中文描述： | 8位微控制器與8至16K的光碟/雙層/存儲器，256的EEPROM，384字節(jié)RAM為512，藝發(fā)局，水分散粒劑，脊髓損傷，SPI和2計時器（8位微控制器（8米）） |
| 文件頁數(shù)： | 23/98頁 |
| 文件大小： | 1123K |
| 代理商： | ST72331 |
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23/98
ST72331
POWER SAVING MODES
(Cont’d)
3.4.4 Halt Mode
The Halt mode is the MCU lowest power con-
sumption mode. The Halt mode is entered by exe-
cuting the HALT instruction. The internal oscillator
is then turned off, causing all internal processing to
be stopped, including the operation of the on-chip
peripherals. The Halt mode cannot be used when
the watchdog is enabled, if the HALT instruction is
executed while the watchdog system is enabled, a
watchdog reset is generated thus resetting the en-
tire MCU.
When entering Halt mode, the I bit in the CC Reg-
ister is cleared so as to enable External Interrupts.
If an interrupt occurs, the CPU becomes active.
The MCU can exit the Halt mode upon reception of
an interrupt or a reset. Refer to the Interrupt Map-
ping Table. The oscillator is then turned on and a
stabilization time is provided before releasing CPU
operation. The stabilization time is 4096 CPU clock
cycles.
After the start up delay, the CPU continues oper-
ation by servicing the interrupt which wakes it up or
by fetching the reset vector if a reset wakes it up.
Figure 18. HALT Flow Chart
N
N
EXTERNAL
INTERRUPT
1)
RESET
HALT INSTRUCTION
4096 CPU CLOCK
CYCLES DELAY
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU CLOCK
I-BIT
OSCILLATOR
PERIPH. CLOCK
2)
ON
OFF
ON
SET
CPU CLOCK
I-BIT
OSCILLATOR
PERIPH. CLOCK
OFF
OFF
OFF
CLEARED
Y
Y
WDG
ENABLED
N
Y
RESET
WATCHDOG
1) or some specific interrupts
2) if reset PERIPH. CLOCK = ON ; if interrupt
PERIPH. CLOCK = OFF
Note:
Before servicing an interrupt, the CC register is
pushed on the stack. The I-Bit is set during the inter-
rupt routine and cleared when the CC register is
popped.
CPU CLOCK
I-BIT
OSCILLATOR
PERIPH. CLOCK
ON
ON
ON
SET
85
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相關代理商/技術參數(shù) |
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|---|---|
| ST72331J2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT MICROCONTROLLER (MCU) WITH 8/16K ROM/OTP/EPROM.256 EEPROM.384/512 BYTES RAM.ADC.WDG.SCI.SPI & 2 TIMERS - SDIP42/56. QFP44/64 |
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