PM0056 datasheet(14/156 Pages) STMICROELECTRONICS

14 / 156 page

The Cortex-M3 processor

PM0056

14/156

DocID15491 Rev 5

In Thread mode, the CONTROL register controls whether the processor uses the main

stack or the process stack, see CONTROL register on page 21. In Handler mode, the

processor always uses the main stack. The options for processor operations are:

2.1.3

Core registers

Figure 2. Processor core registers

Table 1. Summary of processor mode, execution privilege level, and stack use

options

Processor

mode

Used to

execute

Privilege level for

software execution

Stack used

Thread

Applications

Privileged or unprivileged(1)

1. See CONTROL register on page 21.

Main stack or process stack(1)

Handler

Exception handlers

Always privileged

Main stack

Table 2. Core register set summary

Name

Type(1)

Required

privilege(2)

Reset

value

Description

R0-R12

read-write Either

Unknown

General-purpose registers on page 15

MSP

read-write Privileged

See description Stack pointer on page 15

PSP

read-write Either

Unknown

Stack pointer on page 15

SP (R13)

LR (R14)

PC (R15)

R10

R11

R12

Low registers

High registers

MSP

‡

PSP

‡

PSR

PRIMASK

FAULTMASK

BASEPRI

CONTROL

General-purpose registers

Stack Pointer

Link Register

Program Counter

Program status register

Exception mask registers

CONTROL register

Special registers

‡Banked version of SP

ai15996

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