ST20-C1 STMICROELECTRONICS [STMicroelectronics], ST20-C1 Datasheet - Page 161

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

umac
Code: 21 F3
Description: Multiply Areg by Breg, adding in Creg, to form a double word result,
treating the initial values as unsigned. This can be used in forming the double length
product of Areg and Breg, with Creg as carry in.
Definition:
Status Register:
Comments:
See also: mac
Areg
Breg
Creg
where prod (Breg
No effect
Secondary instruction.
Chapter 5 .
unsigned
unsigned
Areg
– the value of prod is calculated to unlimited precision
unsigned
low_word (prod)
high_word (prod)
Areg
unsigned
unsigned multiply accumulate
)
Creg
unsigned
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