ST72F324BJ STMICROELECTRONICS [STMicroelectronics], ST72F324BJ Datasheet - Page 51

• Manufacturer Part Number: ST72F324BJ
• Description: 8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST72324B
Figure 28. HALT timing overview
Figure 29. Halt mode flowchart
1. WDGHALT is an option bit. See
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). Refer to
4. Before servicing an interrupt, the CC register is pushed on the stack. The I[1:0] bits of the CC register are
Table 24: Interrupt mapping
set to the current software priority level of the interrupt routine and recovered when the CC register is
popped.
[MCCSR.OIE = 0]
Run
instruction
for more details.
Halt
N
Section 14.1 on page 172
WDGHALT
(MCCSR.OIE = 0)
Watchdog
Halt
Halt instruction
1
reset
Interrupt
Y
(1)
256 or 4096 CPU
(3)
Enable
cycle delay
interrupt
Reset
0
256 or 4096 CPU clock
Oscillator
Peripherals
CPU
I[1:0] bits
Oscillator
Peripherals
CPU
I[1:0] bits
Oscillator
Peripherals
CPU
I[1:0] bits
N
or
Fetch reset vector
or service interrupt
cycle
for more details.
Y
Reset
Watchdog
(2)
delay
Disable
vector
Fetch
XX
XX
on
off
on
on
on
on
10
off
off
off
(4)
(4)
Run
Power saving modes
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