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ST20-C1 Datasheet(PDF) 135 Page - STMicroelectronics

Part # ST20-C1
Description  Instruction Set Reference Manual
PDF  205 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20-C1 Datasheet(HTML) 135 Page - STMicroelectronics

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8 Instruction Set Reference
®
rmw
memory read modify write
Code: 22 F9
Description: Clear and set bits of the memory word at address Areg using the set
mask in Breg and clear mask in Creg.
Definition:
word
′[Areg] ← (word[Areg] ∧ ~Creg) ∨ Breg
Areg
′← word[Areg]
Breg
′← Areg
Creg
′← Breg
Status Register:
No effect
Comments:
Secondary instruction.
Areg must be word aligned (i.e. divisible by 4).
See also:
bitmask
section 4.8.



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