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5-28-5 MATRIX INPUT – MTR(––)
OW: Output word
IR, SR, AR, HR, LR
IW: Input word
IR, SR, AR, HR, LR
Ladder Symbols Operand Data Areas
MTR(––)
IW
OW
D
D: First destination word
IR, SR, AR, DM, HR, LR
Limitations D and D+3 must be in the same data area.
Overview When
the execution condition is OFF
, MTR(––) is not executed. When the exe
-
cution condition is ON, MTR(––) inputs data from an 8 × 8 matrix and records
that
data in D to D+3. Data for all
64 points in the matrix will be recorded even
when fewer than 64 keys are connected.
01234567
8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 31
32 33 34 35 36 37 38 39
40 41 42 43 44 45 46 47
48 49 50 51 52 53 54 55
56 57 58 59 60 61 62 63
00 01 02 03 04 05 06 07
OW bits 00 to 07
(for Output Unit
outputs 00 to 07)
IW bits 00 to 07
(for Input Unit inputs 00 to 07)
Bit 08 is turned ON to indi-
cate that the entire matrix
has been read.
Key input data is written
to D through D+3 (see
table below).
00
01
02
03
04
05
06
07
08
A
selection signal
is output to OW bits 00 to 07 consecutively for 3 cycles. Only
one
output bit will be turned on at a time. Bit 08 of OW is turned ON for 3 cycles
after
07 to indicate when each round of reading the matrix has been completed.
When one of the 64 keys is pressed, an input will be received at one of the input
bits.
The key that was pressed is identified
by comparing the output bit to which
the signal was output and input bit at which it was received.
When
an key input is detected, the corresponding bit in D through D+3 is turned
ON.
The following table shows the correspondence between keys and bits in D
through D+3.
Word Bits Corresponding Keys
D
00 to 15 0 to 15
D+1
00 to15 16 to 31
D+2
00 to 15 32 to 47
D+3
00 to 15 48 to 63
Advanced I/O Instructions Section 5-28
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