ST20C2 查看數據表（PDF） - STMicroelectronics

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ST20C2

Instruction Set Reference Manual

STMicroelectronics 

stshadow

stshadow

store shadow registers

Code: 60 FD

Description: Selectively store shadow registers of priority Breg into the block of store

addressed by Creg. This instruction is normally used in high priority with Breg set to 1

for low priority. Storing high priority registers from low priority will give undefined

values.

Definition:

if (Areg0 = 1)

{

word′[Creg]16..23

word′[Creg]0..13

}

if (Areg1 = 1)

{

word′[Creg @ 1]

word′[Creg @ 2]

word′[Creg @ 3]

}

if (Areg2 = 1)

{

word′[Creg @ 4]

← GlobalInterruptEnables

← TrapEnables[Breg]

← Status[Breg]

← Wptr[Breg]

← Iptr[Breg]

← Areg[Breg]

word′[Creg @ 5]

word′[Creg @ 6]

}

← Breg[Breg]

← Creg[Breg]

if (Areg3 = 1)

Store block move registers for priority Breg in

word′[Creg @ 7] .. word′[Creg @ 11]

Areg′ ← undefined

Breg′ ← undefined

Creg′ ← undefined

Error signals: none

Comments:

Secondary instruction.

See also: ldshadow restart

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