310
Conversion Instructions
Section 5-20
The result can be calculated by first converting all BCD values to signed
binary and then using the following formula.
Flags
ER:
Indirectly addressed EM/DM word is non-existent.
(Content of
*
EM/
*
DM word is not BCD, or the EM/DM area boundary
has been exceeded.)
The content of S is not BCD.
CY:
CY is not changed by SCL3(––). (CY shows the sign of S before exe-
cution.)
EQ:
ON when the result, R, is 0000.
Example
The status of 00101 determines the sign of the BCD source word in the follow-
ing example. If 00101 is ON, then the source word is negative. When 00100 is
turned ON, the BCD source data in LR 02 is converted to signed binary
according to the parameters in DM 0000 to DM 0004. The result is then writ-
ten to DM 0100. (In the second conversion, the signed binary equivalent of
–1035 is less than the lower limit specified in DM 0004, so the lower limit is
written to DM 0100.)
R =
×
S +P1
∆
X
∆
Y
CLC(41)
STC(40)
00100
Address Instruction
Operands
00000
LD
25313
00001
CLC(41)
00002
LD
00101
00101
STC(40)
00004
LD
00100
00005
SCL3(
−−
)
LR
02
DM
0000
DM
0100
25313
(Always ON)
00101
@SCL3(
−−
)
DM 0000
LR 02
DM 0100
DM 0000 0005
DM 0001 0003
DM 0002 0006
DM 0003 07FF
DM 0004 F800
LR 02
0100
DM 0100
00CD
0005
3
6
CY=0
BCD
Signed hex.
LR 02
1035
DM 0100
F800
CY=1
