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| 型號(hào)： | ST7PLU05MAE |
| 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, PDSO8 |
| 封裝： | 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8 |
| 文件頁(yè)數(shù)： | 72/124頁(yè) |
| 文件大?。?/td> | 1995K |
| 代理商： | ST7PLU05MAE |
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ST7LUS5, ST7LU05, ST7LU09
Power saving modes
51/124
instruction. The main reason for this is that the I/O may be wrongly configured due to
external interference or by an unforeseen logical condition.
●
For the same reason, re-initialize the level sensitiveness of each external interrupt as a
precautionary measure.
●
The opcode for the HALT instruction is 0x8E. To avoid an unexpected HALT instruction
due to a program counter failure, it is advised to clear all occurrences of the data value
0x8E from memory. For example, avoid defining a constant in ROM with the value
0x8E.
●
As the HALT instruction clears the I bit in the CC register to allow interrupts, the user
may choose to clear all pending interrupt bits before executing the HALT instruction.
This avoids entering other peripheral interrupt routines after executing the external
interrupt routine corresponding to the wake-up event (reset or external interrupt).
8.5
Auto Wake-up from Halt mode
Auto Wake-up from Halt (AWUFH) mode is similar to Halt mode with the addition of a
specific internal RC oscillator for wake-up (Auto Wake-up from Halt oscillator) which
replaces the main clock which was active before entering Halt mode. Compared to Active
Halt mode, AWUFH has lower power consumption (the main clock is not kept running), but
there is no accurate real-time clock available.
It is entered by executing the HALT instruction when the AWUEN bit in the AWUCSR
register has been set.
Figure 23.
AWUFH mode block diagram
As soon as Halt mode is entered, and if the AWUEN bit has been set in the AWUCSR
register, the AWU RC oscillator provides a clock signal (fAWU_RC). Its frequency is divided by
a fixed divider and a programmable prescaler controlled by the AWUPR register. The output
of this prescaler provides the delay time. When the delay has elapsed, the following actions
are performed:
●
the AWUF flag is set by hardware,
●
an interrupt wakes up the MCU from Halt mode,
●
the main oscillator is immediately turned on and the 64 CPU cycle delay is used to
stabilize it.
After this start-up delay, the CPU resumes operation by servicing the AWUFH interrupt. The
AWU flag and its associated interrupt are cleared by software reading the AWUCSR
register.
AWU RC
AWUFH
fAWU_RC
AWUFH
(ei0 source)
oscillator
prescaler/1 .. 255
interrupt
/64
divider
to 8-bit Timer input capture
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