Programmer (HHP) User guide

Chapter 1 1
Using Data Handling Instructions
11–17
Operation
When the rung containing this instruction is true, data at the source address
passes through the mask to the destination address. See the following HHP
displays and figure.
P
0 0 0 M V M S R C
B 0 5 5 5 5 H
P
0 0 0 M V M M A S K
F 0 F 0 H
P
0 0 0 M V M D E S T
B 2 F F F F H
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
B2 before move
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
source B0
1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0
Mask F0F0
0 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1
B2 after move
Mask data by setting bits in the mask to zero; pass data by setting bits in the
mask to one. The mask can be a constant value or you can vary the mask by
assigning a direct address. Bits in the destination that correspond to zeros in
the mask are not altered.