ST72521R7T5 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72521R7T5

8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE

STMicroelectronics 

ST72521M/R/AR

INTERRUPTS (Cont’d)

Table 7. Dedicated Interrupt Instruction Set

Instruction

New Description

Function/Example

HALT

IRET

JRM

JRNM

POP CC

RIM

SIM

TRAP

WFI

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)

Software trap

Wait for interrupt

Pop CC, A, X, PC

I1:0=11 ?

I1:0<>11 ?

Mem => CC

Load 10 in I1:0 of CC

Load 11 in I1:0 of CC

Software NMI

I1 H I0 N Z C

1

0

I1 H I0 N Z C

I1 H I0 N Z C

1

0

1

1

1

1

1

0

Note: 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.

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