PM0223 datasheet(16/110 Pages) STMICROELECTRONICS

Part #	PM0223

Description	This programming manual provides information for application and system-level software developers

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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The STM32L0 Cortex-M0+ Processor

PM0223

16/110

DocID025763 Rev 1

See The condition flags on page 43 for more information about the APSR negative, zero,

carry or borrow, and overflow flags.

Interrupt Program Status Register

The IPSR contains the exception number of the current Interrupt Service Routine (ISR). See

the register summary in Table 3 on page 13 for its attributes. The bit assignments are:

Execution Program Status Register

The EPSR contains the Thumb state bit.

See the register summary in Table 3 on page 13 for the EPSR attributes. The bit assign-

ments are:

[28]

Overflow flag.

[27:0]

Reserved.

Table 6. IPSR bit assignments

Bits

Name

Function

[31:6]

Reserved

[5:0]

Exception number

This is the number of the current exception:

0 = Thread mode.

1 = Reserved.

2 = NMI.

3 = HardFault.

4-10 = Reserved.

11 = SVCall.

12, 13 = Reserved.

14 = PendSV.

15 = SysTick | Reserved.

16 = IRQ0.

47 = IRQ31.

48-63 = Reserved.

see Exception types on page 26 for more information.

Table 7. EPSR bit assignments

Bits

Name

Function

[31:25]

Reserved.

[24]

Thumb state bit.

[23:0]

Reserved.

Table 5. APSR bit assignment (continued)

Bits

Name

Description

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