ST STM32H7 Series User Manual

PM0214 Rev 9 19/262
PM0214 The Cortex-M4 processor
261
General-purpose registers
R0-R12 are 32-bit general-purpose registers for data operations.
Stack pointer
The Stack Pointer (SP) is register R13. In Thread mode, bit[1] of the CONTROL register
indicates the stack pointer to use:
• 0: Main Stack Pointer (MSP). This is the reset value.
• 1: Process Stack Pointer (PSP).
On reset, the processor loads the MSP with the value from address 0x00000000.
Link register
The Link Register (LR) is register R14. It stores the return information for subroutines,
function calls, and exceptions. On reset, the processor loads the LR value 0xFFFFFFFF.
Program counter
The Program Counter (PC) is register R15. It contains the current program address. On
reset, the processor loads the PC with the value of the reset vector, which is at address
0x00000004. Bit[0] of the value is loaded into the EPSR T-bit at reset and must be 1.
Program status register
The Program Status Register (PSR) combines:
• Application Program Status Register (APSR)
• Interrupt Program Status Register (IPSR)
• Execution Program Status Register (EPSR)
PSR read-write Privileged 0x01000000 Program status register on page 19
ASPR read-write Either Unknown
Application program status register on
page 21
IPSR read-only Privileged 0x00000000
Interrupt program status register on
page 22
EPSR read-only Privileged 0x01000000
Execution program status register on
page 22
PRIMASK read-write Privileged 0x00000000 Priority mask register on page 24
FAULTMASK read-write Privileged 0x00000000 Fault mask register on page 24
BASEPRI read-write Privileged 0x00000000 Base priority mask register on page 25
CONTROL read-write Privileged 0x00000000 CONTROL register on page 25
1. Describes access type during program execution in thread mode and Handler mode. Debug access can
differ.
2. An entry of either means privileged and unprivileged software can access the register.
Table 3. Core register set summary (continued)
Name Type
(1)
Required
privilege
(2)
Reset
value
Description

ST STM32H7 Series Specifications

General

Brand	ST
Model	STM32H7 Series
Category	Computer Hardware
Language	English