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ST72311R Datasheet(PDF) 37 Page - STMicroelectronics

Part No. ST72311R
Description  8-BIT MCU WITH NESTED INTERRUPTS, EEPROM, ADC, 16-BIT TIMERS, 8-BIT PWM ART, SPI, SCI, CAN INTERFACES
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72311R Datasheet(HTML) 37 Page - STMicroelectronics

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POWER SAVING MODES (Cont’d)
7.4.2 HALT MODE
The HALT mode is the lowest power consumption
mode of the MCU. It is entered by executing the
‘HALT’ instruction when the OIE bit of the Main
Clock Controller Status register (MCCSR) is
cleared (see Section 10.2 on page 52 for more de-
tails on the MCCSR register).
The MCU can exit HALT mode on reception of ei-
ther a specific interrupt (see Table 7, “Interrupt
Mapping,” on page 32) or a RESET. When exiting
HALT mode by means of a RESET or an interrupt,
the oscillator is immediately turned on and the
4096 CPU cycle delay is used to stabilize the os-
cillator. After the start up delay, the CPU resumes
operation by servicing the interrupt or by fetching
the reset vector which woke it up (see Figure 24).
When entering HALT mode, the I bit in the CC reg-
ister is forced to 0 to enable interrupts. Therefore,
if an interrupt is pending, the MCU wakes immedi-
ately.
In HALT mode, the main oscillator is turned off
causing all internal processing to be stopped, in-
cluding the operation of the on-chip peripherals.
All peripherals are not clocked except the ones
which get their clock supply from another clock
generator (such as an external or auxiliary oscilla-
tor).
The compatibility of Watchdog operation with
HALT mode is configured by the “WDGHALT” op-
tion bit of the option byte. The HALT instruction
when executed while the Watchdog system is en-
abled, can generate a Watchdog RESET (see
Section 14.1 on page 158 for more details).
Figure 23. HALT Timing Overview
Figure 24. HALT Mode Flow-chart
Notes:
1. WDGHALT is an option bit. See option byte sec-
tion for more details.
2. Peripheral clocked with an external clock source
can still be active.
3. Only some specific interrupts can exit the MCU
from HALT mode (such as external interrupt). Re-
fer to Table 7, “Interrupt Mapping,” on page 32 for
more details.
4. Before servicing an interrupt, the CC register is
pushed on the stack. The I[1:0] bits of the CC reg-
ister are set to the current software priority level of
the interrupt routine and recovered when the CC
register is popped.
HALT
RUN
RUN
4096 CPU CYCLE
DELAY
RESET
OR
INTERRUPT
HALT
INSTRUCTION
FETCH
VECTOR
[MCCSR.OIE=0]
HALT INSTRUCTION
RESET
INTERRUPT 3)
Y
N
N
Y
CPU
OSCILLATOR
PERIPHERALS 2)
I[1:0] BITS
OFF
OFF
10
OFF
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
OFF
XX 4)
ON
CPU
OSCILLATOR
PERIPHERALS
I[1:0] BITS
ON
ON
XX 4)
ON
4096 CPU CLOCK CYCLE
DELAY
WATCHDOG
ENABLE
DISABLE
WDGHALT 1)
0
WATCHDOG
RESET
1
(MCCSR.OIE=0)


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