ST72321BR9-AUTO View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST72321BR9-AUTO

8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface

STMicroelectronics 

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ST72321Bxxx-Auto

Figure 20. Nested interrupt management

Interrupts

RIM

MAIN

11 / 10

IT1

IT2

TRAP

IT0

IT4

IT4

IT1

IT3

SOFTWARE

PRIORITY

LEVEL

IT2

MAIN

10

I1

I0

3

11

3

11

2

00

1

01

3

11

3

11

3/0

7.5

7.5.1

Interrupt register description

CPU CC register interrupt bits

CPU CC

7

6

1

1

Reset value: 111x 1010 (xAh)

5

4

3

2

1

0

I1

H

I0

N

Z

C

RW

RW

RW

RW

RW

RW

Table 15. CPU CC register interrupt bits description

Bit

Name

Function

5

I1

Interrupt Software Priority 1

3

I0

Interrupt Software Priority 0

These two bits indicate the current interrupt software priority (see Table 16) and are

set/cleared by hardware when entering in interrupt. The loaded value is given by the

corresponding bits in the interrupt software priority registers (ISPRx).

They can be also set/cleared by software with the RIM, SIM, HALT, WFI, IRET and

PUSH/POP instructions (see Table 18: Interrupt dedicated instruction set).

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