201
Publication 1763-RM001C-EN-P - October 2009
Chapter
10
Conversion Instructions
The conversion instructions multiplex and de-multiplex data and perform
conversions between binary and decimal values.
Using Decode and
Encode Instructions
Addressing Modes and File Types can be used as shown in the following
table:
Instruction
Used To:
Page
DCD - Decode 4 to 1-of-16
Decodes a 4-bit value (0 to 15), turning on the
corresponding bit in the 16-bit destination.
ENC - Encode 1-of-16 to 4
Encodes a 16-bit source to a 4-bit value.
Searches the source from the lowest to the
highest bit and looks for the first set bit. The
corresponding bit position is written to the
destination as an integer.
FRD - Convert From Binary
Coded Decimal
Converts the BCD source value to an integer and
stores it in the destination.
TOD - Convert to Binary Coded
Decimal
Converts the integer source value to BCD format
and stores it in the destination.
Conversion Instructions Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 82.
Parameter
Data Files
Function Files
C
S
-
Comms
IO
S - I/O
DL
S
-
D
a
ta
L
o
g
Address
Mode
(1)
Address Level
O
I
S
B
T,
C
, R
N
F
ST
L
MG,
PD
R
I/RIX
PL
S
RT
C
HS
C
PT
O,
P
W
M
ST
I
EII
BH
I
MMI
LC
D
Im
mediate
Dir
ect
Indir
e
c
t
Bi
t
Wo
rd
Lo
ng W
o
rd
Elemen
t
Source
•
•
•
•
•
•
•
•
•
Destination
•
•
•
•
•
•
•
•
•
(1) See Important note about indirect addressing.
IMPORTANT
You cannot use indirect addressing with: S, ST, MG, PD,
RTC, HSC, PTO, PWM, STI, EII, BHI, MMI, CS, IOS, and
DLS files.
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