PM0214 datasheet(107/245 Pages) STMICROELECTRONICS

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PM0214

The STM32 Cortex-M4 instruction set

244

3.5.24

USUB16 and USUB8

Unsigned subtract 16 and Unsigned subtract 8

Syntax

op{cond}{Rd,} Rn, Rm

where:

•

op is any of:

USUB16: Unsigned Subtract 16.

USUB8: Unsigned Subtract 8.

•

‘cond’ is an optional condition code (see Conditional execution on page 64)

•

‘Rd’ is the destination register

•

‘Rn’ is the register holding the operand

•

‘Rm’ is the second operand register

Operation

Use these instructions to subtract 16-bit and 8-bit data before writing the result to the

destination register:

The USUB16 instruction:

Subtracts each halfword from the second operand register from the corresponding

halfword of the first operand register.

Writes the unsigned result in the corresponding halfwords of the destination register.

The USUB8 instruction:

Subtracts each byte of the second operand register from the corresponding byte of the

first operand register.

Writes the unsigned byte result in the corresponding byte of the destination register.

Restrictions

Do not use SP or PC.

Condition flags

These instructions do not change the flags.

Examples

USUB16 R1, R0

; Subtracts halfwords in R0 from corresponding halfword of

; R1 and writes to corresponding halfword in R1

USUB8

R4, R0, R5 ; Subtracts bytes of R5 from corresponding byte in R0 and

; writes to the corresponding byte in R4.

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