参数资料
型号: ST7PSCR1R4T1
厂商: 意法半导体
英文描述: 8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER
中文描述: 8位低功耗,全速USB微控制器与16K的闪存,768内存,智能卡的I /楼,计时器
文件页数: 29/102页
文件大小: 1413K
代理商: ST7PSCR1R4T1
ST7SCR
29/102
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.
Note:
The PLL must be disabled before a HALT
instruction.
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 512 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 20. HALT Mode Flow Chart
N
N
EXTERNAL
INTERRUPT*
RESET
HALT INSTRUCTION
512 CPU CLOCK
CYCLES DELAY
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU CLOCK
I-BIT
OSCILLATOR
PERIPH. CLOCK
ON
ON
ON
SET
CPU CLOCK
I-BIT
OSCILLATOR
PERIPH. CLOCK
OFF
OFF
OFF
CLEARED
Y
Y
Note:
Before servicing an interrupt, the CC
register is pushed on the stack. The I-Bit is set
during the interrupt routine and cleared when
the CC register is popped.
1
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