STEVAL-ISB005V1 STMicroelectronics, STEVAL-ISB005V1 Datasheet - Page 46
STEVAL-ISB005V1
Manufacturer Part Number
STEVAL-ISB005V1
Description
BOARD EVAL CHARGER ST7260/L6924D
Manufacturer
STMicroelectronics
Type
Battery Managementr
Specifications of STEVAL-ISB005V1
Main Purpose
Power Management, Battery Charger
Embedded
Yes, MCU, 8-Bit
Utilized Ic / Part
L6924, ST72F63BK6M1
Primary Attributes
1 Cell- Li-Ion / Li-Pol, 5 V (USB Input)
Secondary Attributes
Powered by Wall Adaptor Also, LED Status Indicators
Input Voltage
5 V
Product
Power Management Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
L6924D, ST7260
Other names
497-8428
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
STEVAL-ISB005V1
Manufacturer:
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Watchdog timer (WDG)
12.3.3
12.3.4
12.3.5
46/139
Low power modes
WAIT Instruction
No effect on Watchdog.
HALT Instruction
If the Watchdog reset on HALT option is selected by option byte, a HALT instruction causes
an immediate reset generation if the Watchdog is activated (WDGA bit is set).
Using Halt mode with the WDG (option)
If the Watchdog reset on HALT option is not selected by option byte, the Halt mode can be
used when the watchdog is enabled.
In this case, the HALT instruction stops the oscillator. When the oscillator is stopped, the
WDG stops counting and is no longer able to generate a reset until the microcontroller
receives an external interrupt or a reset.
If an external interrupt is received, the WDG restarts counting after 4096 CPU clocks. If a
reset is generated, the WDG is disabled (reset state).
Recommendations
●
●
●
●
●
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Interrupts
None.
Make sure that an external event is available to wake up the microcontroller from Halt
mode.
Before executing the HALT instruction, refresh the WDG counter, to avoid an
unexpected WDG reset immediately after waking up the microcontroller.
When using an external interrupt to wake up the microcontroller, reinitialize 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 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).
ST7260xx
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