ST20-C1 STMICROELECTRONICS [STMicroelectronics], ST20-C1 Datasheet - Page 127

• Manufacturer Part Number: ST20-C1
• Description: Instruction Set Reference Manual
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

mac
Code: 21 F2
Description: Multiply Areg and Breg, and add in Creg. The most significant word of
the result is placed in Breg and the least significant in Areg. This can be used in
forming the double length product of Areg and Breg, with Creg as carry in, treating
the Areg and Breg values as signed but Creg as unsigned.
Definition:
Status Register:
Comments:
See also: ldiv mul umac
Areg
Breg
Creg
where
No effect
Secondary instruction.
Chapter 5 .
accum64 (Breg
– the value of accum64 is calculated as a 64-bit value
low_word accum64)
high_word accum64)
Areg
Areg)
Creg
unsigned
multiply accumulate
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