ST72521R9-Auto STMicroelectronics, ST72521R9-Auto Datasheet - Page 69

• Manufacturer Part Number: ST72521R9-Auto
• Description: 8-bit MCU for automotive
• Manufacturer: STMicroelectronics

Specifications of ST72521R9-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
• 4 Power Saving Modes: Halt, Active Halt, Wait and Slow

ST72521xx-Auto
Figure 25. Active Halt timing overview
1. This delay occurs only if the MCU exits Active Halt mode by means of a RESET.
Figure 26. Active Halt mode flowchart
1. Peripheral clocked with an external clock source can still be active.
2. Before servicing an interrupt, the CC register is pushed on the stack. The I[1:0] bits of the CC register are
3. In Flash devices only the MCC/RTC interrupt can exit the MCU from Active Halt mode.
set to the current software priority level of the interrupt routine and restored when the CC register is
popped.
HALT INSTRUCTION
[MCCSR.OIE = 1]
N
INSTRUCTION
(MCCSR.OIE = 1)
RUN
HALT
INTERRUPT
ACTIVE
HALT
Y
Doc ID 17660 Rev 1
(3)
256 OR 4096 CPU
CYCLE DELAY
INTERRUPT
RESET
OR
256 OR 4096 CPU CLOCK
OR SERVICE INTERRUPT
OSCILLATOR
PERIPHERALS
CPU
OSCILLATOR
PERIPHERALS
CPU
OSCILLATOR
PERIPHERALS
CPU
FETCH RESET VECTOR
I[1:0] BITS
I[1:0] BITS
I[1:0] BITS
N
CYCLE DELAY
(1)
RESET
Y
VECTOR
FETCH
(1)
RUN
XX
XX
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
10
Power saving modes
(2)
(2)
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