ST72521R9-Auto STMicroelectronics, ST72521R9-Auto Datasheet - Page 58

• 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

Interrupts
Caution:
Note:
58/276
The TLI, RESET, and TRAP vectors have no software priorities. When one is serviced, the
I1 and I0 bits of the CC register are both set.
If the I1_x and I0_x bits are modified while the interrupt x is executed the following behavior
has to be considered: If the interrupt x is still pending (new interrupt or flag not cleared) and
the new software priority is higher than the previous one, the interrupt x is re-entered.
Otherwise, the software priority stays unchanged up to the next interrupt request (after the
IRET of the interrupt x).
Table 19.
During the execution of an interrupt routine, the HALT, POPCC, RIM, SIM and WFI
instructions change the current software priority up to the next IRET instruction or one of the
previously mentioned instructions.
Instruction
POP CC
JRNM
TRAP
HALT
IRET
JRM
RIM
SIM
WFI
Interrupt dedicated instruction set
Entering Halt mode
Interrupt routine return
Jump if I1:0 = 11 (level 3)
Jump if I1:0 <> 11
Pop CC from the Stack
Enable interrupt (level 0 set)
Disable interrupt (level 3 set) Load 11 in I1:0 of CC
Software trap
Wait for interrupt
New description
Doc ID 17660 Rev 1
Pop CC, A, X, PC
I1:0 = 11 ?
I1:0 <> 11 ?
Mem => CC
Load 10 in I1:0 of CC
Software NMI
Function/Example
I1
I1
I1
1
1
1
1
1
H
H
H
I0
I0
I0
0
0
1
0
1
ST72521xx-Auto
N
N
N
Z
Z
Z
C
C
C