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ST7DALI Datasheet(PDF) 41 Page - STMicroelectronics

Part No. ST7DALI
Description  8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI, DALI
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST7DALI
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POWER SAVING MODES (Cont’d)
9.4.1 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, 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 ex-
ternal interference or by an unforeseen logical
condition.
– For the same reason, reinitialize the level sensi-
tiveness of each external interrupt as a precau-
tionary 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 memo-
ry. For example, avoid defining a constant in pro-
gram memory 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 be-
fore executing the HALT instruction. This avoids
entering other peripheral interrupt routines after
executing the external interrupt routine corre-
sponding to the wake-up event (reset or external
interrupt).
9.5 ACTIVE-HALT MODE
ACTIVE-HALT mode is the lowest power con-
sumption mode of the MCU with a real time clock
available. It is entered by executing the ‘HALT’ in-
struction. The decision to enter either in ACTIVE-
HALT or HALT mode is given by the LTCSR/ATC-
SR register status as shown in the following table:
The MCU can exit ACTIVE-HALT mode on recep-
tion of a specific interrupt (see Table 5, “Interrupt
Mapping,” on page 35) or a RESET.
– When exiting ACTIVE-HALT mode by means of
a RESET, a 256 or 4096 CPU cycle delay oc-
curs. After the start up delay, the CPU resumes
operation by fetching the reset vector which
woke it up (see Figure 26).
– When exiting ACTIVE-HALT mode by means of
an interrupt, the CPU immediately resumes oper-
ation by servicing the interrupt vector which woke
it up (see Figure 26).
When entering ACTIVE-HALT mode, the I bit in
the CC register is cleared to enable interrupts.
Therefore, if an interrupt is pending, the MCU
wakes up immediately (see Note 3).
In ACTIVE-HALT mode, only the main oscillator
and the selected timer counter (LT/AT) are running
to keep a wake-up time base. All other peripherals
are not clocked except those which get their clock
supply from another clock generator (such as ex-
ternal or auxiliary oscillator).
Note: As soon as ACTIVE-HALT is enabled, exe-
cuting a HALT instruction while the Watchdog is
active does not generate a RESET.
This means that the device cannot spend more
than a defined delay in this power saving mode.
LTCSR1
TB1IE bit
ATCSR
OVFIE
bit
ATCSR
CK1 bit
ATCSR
CK0 bit
Meaning
0x
x
0
ACTIVE-HALT
mode disabled
00
x
x
1
xxx
ACTIVE-HALT
mode enabled
x
101
1




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