參數(shù)資料
型號(hào): ST7PL05Y0MB/XXXTRE
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO16
封裝: 0.150 INCH WIDTH, PLASTIC, LEAD FREE, SOP-16
文件頁數(shù): 35/106頁
文件大?。?/td> 1990K
代理商: ST7PL05Y0MB/XXXTRE
ST7L05, ST7L09
34/104
POWER SAVING MODES (Cont’d)
9.4.2 HALT Mode
The HALT mode is the lowest power consumption
mode of the MCU. It is entered by executing the
‘HALT’ instruction when active halt mode is disa-
bled.
The MCU can exit HALT mode on reception of ei-
ther a specific interrupt (see Table 7, “Interrupt
Mapping,” on page 29) or a RESET. When exiting
HALT mode by means of a RESET or an interrupt,
the oscillator is immediately turned on and the 256
CPU cycle delay is used to stabilize the oscillator.
After the start up delay, the CPU resumes opera-
tion by servicing the interrupt or by fetching the re-
set vector which woke it up (see Figure 22).
When entering HALT mode, the I bit in the CC reg-
ister is forced to 0 to enable interrupts. Therefore,
if an interrupt is pending, the MCU wakes immedi-
ately.
In HALT mode, the main oscillator is turned off
causing all internal processing to stop, including
the operation of the on-chip peripherals. All periph-
erals are not clocked except the ones which get
their clock supply from another clock generator
(such as an external or auxiliary oscillator).
The compatibility of Watchdog operation with
HALT mode is configured by the “WDGHALT” op-
tion bit of the option byte. The HALT instruction
when executed while the Watchdog system is en-
abled, can generate a Watchdog RESET (see
Section 15.2 on page 96 for more details).
Figure 21. HALT Timing Overview
Figure 22. HALT Mode Flowchart
Notes:
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 some specific interrupts can exit the MCU from
HALT mode (such as external interrupt). Refer to Table 7,
4. 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.
5. If the PLL is enabled by option byte, it outputs the clock
after a delay of tSTARTUP (see Figure 11).
HALT
RUN
256 CPU CYCLE
DELAY
RESET
OR
INTERRUPT
HALT
INSTRUCTION
FETCH
VECTOR
[Active Halt disabled]
HALT INSTRUCTION
RESET
INTERRUPT3)
Y
N
Y
CPU
OSCILLATOR
PERIPHERALS2)
IBIT
OFF
0
OFF
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU
OSCILLATOR
PERIPHERALS
IBIT
ON
OFF
X4)
ON
CPU
OSCILLATOR
PERIPHERALS
IBITS
ON
X4)
ON
256 CPU CLOCK CYCLE
DELAY
WATCHDOG
ENABLE
DISABLE
WDGHALT1)
0
WATCHDOG
RESET
1
(Active Halt disabled)
1
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