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ST72321R7-Auto 数据表(PDF) 69 Page - STMicroelectronics

部件名 ST72321R7-Auto
功能描述  PLL for 2x frequency multiplication
PDF  243 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST72321R7-Auto 数据表(HTML) 69 Page - STMicroelectronics

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ST72321xx-Auto
Power saving modes
Doc ID 13829 Rev 1
69/243
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. For example, avoid defining a constant in ROM with the value
0x8E.
●
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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