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ST72325AR7-Auto 데이터시트(PDF) 73 Page - STMicroelectronics

부품명 ST72325AR7-Auto
상세설명  SCI asynchronous serial interface
PDF  243 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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ST72325AR7-Auto 데이터시트(HTML) 73 Page - STMicroelectronics

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Obsolete
Product(s)
- Obsolete
Product(s)
ST72325xxx-Auto
Power saving modes
Doc ID 13770 Rev 3
73/243
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, reinitialize 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.
●
As the HALT instruction clears the interrupt mask 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).
Related documentation
ST7 Keypad Decoding Techniques, Implementing Wake-Up on Keystroke (AN 980)
How to Minimize the ST7 Power Consumption (AN1014)
Using an active RC to wake up the ST7LITE0 from power saving mode (AN1605)



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