Instructions fun 121 dec decode – Toshiba 6F3B0253 User Manual
Page 203
6F3B0253
Basic Hardware and Function
201
7. Instructions
FUN 121
DEC
Decode
Expression
Input
−
[ A DEC (n) B ]
−
Output
Function
When the input is ON, this instruction sets the bit position which is designated by lower n bits of A
to ON in the bit table, size 2
n
bits starting with 0 bit (LSB) of B, and resets all other bits to OFF.
Execution condition
Input
Operation
Output
OFF
No execution
OFF
ON
Execution
ON
Operand
Name
Device
Register
Constant Index
X
Y
R
S
T.
C. XW YW RW SW T
C
D
I
J
K
A Decode source
√
√
√
√
√
√
√
√
√
√
n Table size
1 - 8
B Start of table
√
√
√
√
√
√
Example
2
5
(=32) bits starting with 0 bit of RW05 (R050 to R06F) are defined as the bit table.
When R011 is ON, the bit position designated by lower 5 bits of D0011 in the bit table is set to
ON, and all other bits in the table are reset to OFF.
The following figure shows an operation example.
F E D C B A
9
8
7
6
5
4
3
2
1
0
D0011
1 1 0 0 0
Ignored
H18 (=24)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
3 2 1
0
0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0
RW06
RW05
Sets ON