ST20C2 datasheet(131/212 Pages) STMICROELECTRONICS

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move2dzero

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move2dzero

2D block copy zero bytes

Code: 25 FE

Description: Copy zero valued bytes from a 2D block of memory to another, non-

overlapping, area using parameters set up by

move2dinit. The copy is performed

using the minimum number of word reads. Areg is the number of bytes in each row,

Breg is the address of the destination, and Creg is the address of the source.

Definition:

if (

source and destination overlap)

Undefined effect

else for y = 0 .. (count

− 1)

for x = 0 .. (Aregunsigned − 1)

if (byte[Creg

+ (y × srcStride) + x] = 0)

byte

′[Breg + (y × dstStride) + x] ← byte[Creg + (y × srcStride) + x]

Areg

′← undefined

Breg

′← undefined

Creg

′← undefined

where

count

= Move2dBlockLength

dstStride

= Move2dDestStride

srcStride

= Move2dSourceStride

Error signals: none

Comments:

Secondary instruction.

Instruction is interruptible.

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