ST20-C1 STMICROELECTRONICS [STMicroelectronics], ST20-C1 Datasheet - Page 112

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

io
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:
Status Register:
Comments:
See also: bitmask
112/205
IOreg
Areg
Breg
Creg
No effect
Secondary instruction.
Some bits of the IO register may be reserved in some variants. See the datasheet
for the variant.
section 4.11.
(IOreg
IOreg
Creg
Areg
(~Breg
#FFFF0000))
(Areg
#FFFF)
input/output