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4. Operation section
(1) Outline
The operation circuit is composed of the key matrix circuit and the
display circuit.
Besides, communication with is made with the IR unit.
1
Block diagram
DATA
CLK
OP control
PWB
LATCH
BEO
32bit driver block diagram
DATA
32 bit Shift Register
CLK
LATCH
BIO
Driver ON/OFF Control
GND
01
VC (+12V)
OUT
S IN
VD
CLK LATCH
Sout
32 bit Latch
VD
Driver
GND
032
OP control PWB
LED
S OUT
STROBE
BEO
VD (+5V)
VD (+5V) VC (+12V)
DC power
circuit
2
Operations
1
Clock
Data signal
Latch signal
BEO signal
Output
LED or key
1
2
3
4
31
32
The data signal (8 bit) sent from the OP control PWB are shifted at
the timing of rising of the clock and retained at the timing of rising of
the latch signal.
The retained data are outputted when the BE0 signal becomes HIGH
(5V) to light the LED or to select the key matrix (F1 ∼ F13). Key
reading is made by scanning K10 ∼ K15 for every F1 ∼ F13 selected.
9 – 16
KEY
Key matrix
F1~F13
KI0~KI5
8
5V
5V
5V
LL level (0V)
LED lights up.
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