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ST72321BXXX-AUTO Datasheet(PDF) 74 Page - STMicroelectronics |
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ST72321BXXX-AUTO Datasheet(HTML) 74 Page - STMicroelectronics |
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74 / 247 page  Power saving modes ST72321Bxxx-Auto 74/247 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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