ST20-C1 datasheet(112/205 Pages) STMICROELECTRONICS

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ST20-C1 Datasheet(PDF) 112 Page - STMicroelectronics

Part #	ST20-C1

Description	Instruction Set Reference Manual

PDF	205 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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112 / 205 page

112/205

input/output

Code: 23 FD

Description: Set, clear and test bits of the IO register. The bits set in the least

significant half word of Breg are cleared in the IO register and then the bits set in the

least significant half word of Areg are set in the IO register. The initial IO register is

copied into the Areg.

Definition:

IOreg

′← (IOreg ∧ (~Breg ∨ #FFFF0000)) ∨ (Areg ∧ #FFFF)

Areg

′← IOreg

Breg

′← Creg

Creg

′← Areg

Status Register:

No effect

Comments:

Secondar y instruction.

Some bits of the IO register may be reserved in some variants. See the datasheet

for the variant.

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