PM0215 datasheet(12/91 Pages) STMICROELECTRONICS

12 / 91 page

The STM32 Cortex-M0 processor

PM0215

12/91

Doc ID 022979 Rev 1

2.1.3

Core registers

Figure 2.

Processor core registers

General-purpose registers

R0-R12 are 32-bit general-purpose registers for data operations.

Table 3.

Core register set summary

Name

Type(1)

Describes access type during program execution in Thread and Handler modes. Debug access can differ.

Reset value

Description

R0-R12

read-write

Unknown

General-purpose registers on page 12

MSP

read-write

See description

Stack pointer (SP) register R13 on page 13

PSP

read-write

Unknown

Stack pointer (SP) register R13 on page 13

read-write

Unknown

Link register (LR) register R14 on page 13

read-write

See description

Program counter (PC) register R15 on page 13

PSR

read-write

Unknown(2)

Bit[24] is the T-bit and is loaded from bit[0] of the reset vector.

Program status register on page 13

ASPR

read-write

Unknown

Application program status register on page 14

IPSR

read-only

0x00000000

Interrupt program status register on page 14

EPSR

read-only

Unknown(2)

Execution program status register on page 15

PRIMASK

read-write

0x00000000

Priority mask register on page 15

CONTROL

read-write

0x00000000

Control register on page 16

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