Hitachi NJI-350B User Manual
Page 102
Chapter 5 Instruction Specifications
5-52
Item number
Arithmetic instructions-7
Name
BCD multiplication (BCD MULTIPLICATION)
Ladder format
Condition code
Processing time (
µs)
Remark
R7F4
R7F3
R7F2
R7F1
R7F0
Average Maximum
d = s1 B
× s2
DER
ERR
SD
V
C
Upper case: W
↕
z
z
z
z
164
Lower case: DW
Instruction format
Number of steps
Condition
Steps
d = s1 B
× s2
Word
4
447
Double word
6
Bit
Word
Double word
Usable I/O
X
Y
R,
M
TD, SS,
CU, CT
WX WY
WR,
WM TC DX DY
DR,
DM
C
onstant
Other
d
Substitution destination
{
{
{
{
{
s1 Multiplicand
{
{
{
{
{
{
{
{
s2 Multiplier
{
{
{
{
{
{
{
{
Function
• Multiplies s1 and s2 as the BCD data, and substitutes the result into d+1 (upper digit) and d (lower digit) as the BCD data.
• The DER flag is set to “1” if s1 or s2 is an invalid BCD data. In this case, the operation is not performed. Also, if d+1
exceeds the usable I/O range, the DER flag is set to “1” and only the lower digit word is substituted. The DER flag is set to
“0” if s1 and s2 are valid BCD data and d+1 is within the usable I/O range.
MSB
0
MSB
0
d
0
MSB
d+1
×
WR0014
WR0015
WR0016
WR0017
×
Example: WR0016 = WR0014 Bx WR0015
DR0016
WR0019
×
DR0018
WR0018
WR0021
DR0020
WR0020
WR0023
DR0022
WR0022
WR0025
WR0024
s1
d+1
d+1
DR0024
Example: DR0022 = DR0018 Bx DR0020
s2
s1
s2
d
s1
s2
d
Notes
• The combinations of d, s1 and s2 are as follows:
d
s1
s2
Word
Word
Word
Double word
Double word
Double word
• Since the operation results are always substituted into d and d + 1, note that the word or double-word at d + 1 is not used as
the I/O of others.
Program example
X00000
WR0016 = WR0014 B* WR0015
LD X00000
[
WR0016 = WR0014 B * WR0015
]
Program description
• When input X00000 is on, the product of WR0014 value and WR0015 value is substituted into WR0016 as the BCD data.
d
=
s1
B x s2