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o
Data logic
1)
Keyboard output:
1 = High level
O = Low level
2)
Unit output:
Unit not-busy = High level
Unit busy = Low level
(2)
KBCLK:
Clock signal output from the keyboard.
Also the self-test
Signal input from the system unit.
Negative logic.
4.4
KBDATA and KBCLK Output Timing
Both signals are bidirectional, and transfer data between the system unit
and the keyboard under the following conditions:
(1)
When KBDATA = H and KBCLK = H at the system unit:
Scale on the
abscissa:
0.1 ms/div
Top:
KBDATA
Bottom:
KBCLK
Figure 4-2
KBDATA and KBCLK Outputs
Key
ON
OFF
Ly
|
Ly!
1 }
|
t.
= 30 ms max
ty
to
1
|
|
|
|
|
t.
= 30 ms max
'H!
|
2
KBDATA
'TZ,!
Figure 4-3
KBDATA Output Timing
IV - 7
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