The STM32 Cortex-M4 instruction set PM0214
100/262 PM0214 Rev 10
3.5.16 UADD16 and UADD8
Unsigned Add 16 and Unsigned Add 8
Syntax
op{cond}{Rd,} Rn, Rm
Where:
• op is one of the following:
UADD16: Performs two 16-bit unsigned integer additions.
UADD8: Performs four 8-bit unsigned integer additions.
• ‘cond’ is an optional condition code (see Conditional execution on page 65).
• ‘Rd’ is the destination register.
• ‘Rn’ is the first register holding the operand.
• ‘Rm’ is the second register holding the operand.
Operation
Use these instructions to add 16- and 8-bit unsigned data:
The UADD16 instruction:
1. Adds each halfword from the first operand to the corresponding halfword of the second
operand.
2. Writes the unsigned result in the corresponding halfwords of the destination register.
The UADD16 instruction:
1. Adds each byte of the first operand to the corresponding byte of the second operand.
2. Writes the unsigned result in the corresponding byte of the destination register.
Restrictions
Do not use SP and do not use PC.
Condition flags
These instructions do not change the flags.
Examples
UADD16 R1, R0 ; Adds halfwords in R0 to corresponding halfword of R1,
; writes to corresponding halfword of R1
UADD8 R4, R0, R5 ; Adds bytes of R0 to corresponding byte in R5 and writes
; to corresponding byte in R4.
To Next Page
Loading...
Need help?
General
