ST72521R9-Auto STMicroelectronics, ST72521R9-Auto Datasheet - Page 3
ST72521R9-Auto
Manufacturer Part Number
ST72521R9-Auto
Description
8-bit MCU for automotive
Manufacturer
STMicroelectronics
Datasheet
1.ST72521R9-AUTO.pdf
(276 pages)
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
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ST72521xx-Auto
7
8
9
6.4
6.5
6.6
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.1
7.2
7.3
7.4
7.5
7.6
Power saving modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
8.1
8.2
8.3
8.4
I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
9.1
Multi-oscillator (MO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Reset sequence manager (RSM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.5.1
6.5.2
6.5.3
6.5.4
6.5.5
System integrity management (SI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.6.1
6.6.2
6.6.3
6.6.4
6.6.5
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Masking and processing flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Interrupts and low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Concurrent and nested management . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Interrupt register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
7.5.1
7.5.2
External interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
7.6.1
7.6.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Slow mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Wait mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Active Halt and Halt modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
8.4.1
8.4.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Asynchronous external RESET pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
External power-on RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Internal low voltage detector (LVD) RESET . . . . . . . . . . . . . . . . . . . . . . 44
Internal watchdog RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Low voltage detector (LVD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Auxiliary voltage detector (AVD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Low power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
System Integrity (SI) Control/Status register (SICSR) . . . . . . . . . . . . . . 50
CPU CC register interrupt bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Interrupt software priority registers (ISPRx) . . . . . . . . . . . . . . . . . . . . . . 57
I/O port interrupt sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
External interrupt control register (EICR) . . . . . . . . . . . . . . . . . . . . . . . . 62
Active Halt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Halt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
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