参数资料
型号: ST7FLU05MAE
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
封装: 0.150 INCH, LEAD FREE, PLASTIC, SOP-8
文件页数: 73/124页
文件大小: 2186K
代理商: ST7FLU05MAE
Obsolete
Product(s)
- Obsolete
Product(s)
Power saving modes
ST7LUS5, ST7LU05, ST7LU09
52/124
Halt mode recommendations
Make sure that an external event is available to wake up the microcontroller from Halt
mode.
When using an external interrupt to wake up the microcontroller, re-initialize the
corresponding I/O as “input pull-up with interrupt” before executing the HALT
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 24.
AWUFH mode block diagram
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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