ST72324BK datasheet(40/188 Pages) STMICROELECTRONICS

Part #	ST72324BK

Description	8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI

PDF	188 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Interrupts

ST72324B

40/188

Figure 21.

Nested interrupt management

7.5

Interrupt registers

7.5.1

CPU CC register interrupt bits

These two bits indicate the current interrupt software priority (see Table 15) 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 17: Dedicated interrupt instruction set).

Main

IT2

TRAP

Main

IT0

3/0

RIM

IT1

IT4

IT1

IT2

IT3

11 / 10

Software

priority

level

CPU CC

Reset value: 111x 1010(xAh)

654

NZC

R/W

Table 14.

CPU CC register interrupt bits description

Bit Name

Function

Software Interrupt Priority 1

Software Interrupt Priority 0

Table 15.

Interrupt software priority levels

Interrupt software priority

Level

Level 0 (main)

Low

High

Level 1

Level 2

Level 3 (= interrupt disable)(1)

TRAP and RESET events can interrupt a level 3 program.

ST72324BK Datasheet(PDF) 40 Page - STMicroelectronics

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