参数资料
型号: ST72621L4T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
封装: TQFP-44
文件页数: 57/134页
文件大小: 815K
代理商: ST72621L4T1
ST7262
29/134
POWER SAVING MODES (Cont’d)
8.3 HALT MODE
The HALT mode is the MCU lowest power con-
sumption mode. The HALT mode is entered by ex-
ecuting the HALT instruction. The internal oscilla-
tor is then turned off, causing all internal process-
ing to be stopped, including the operation of the
on-chip peripherals.
When entering HALT mode, the I bit in the Condi-
tion Code Register is cleared. Thus, any of the ex-
ternal interrupts (ITi or USB end suspend mode),
are allowed and if an interrupt occurs, the CPU
clock becomes active.
The MCU can exit HALT mode on reception of ei-
ther an external interrupt on ITi, an end suspend
mode interrupt coming from USB peripheral, or a
reset. The oscillator is then turned on and a stabi-
lization time is provided before releasing CPU op-
eration. The stabilization time is 514 CPU clock cy-
cles.
After the start up delay, the CPU continues opera-
tion by servicing the interrupt which wakes it up or
by fetching the reset vector if a reset wakes it up.
Figure 22. HALT Mode Flow Chart
N
EXTERNAL
INTERRUPT*
RESET
HALT INSTRUCTION
514 CPU CLOCK
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CYCLES DELAY
CPU CLOCK
OSCILLATOR
PERIPH. CLOCK
I-BIT
ON
SET
ON
CPU CLOCK
OSCILLATOR
PERIPH. CLOCK
I-BIT
OFF
CLEARED
OFF
Y
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.
1
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