Panasonic JB-3300 Technical Manual page 310

KBCLK
KBDATA
(3)
When KBDATA goes LOW, the keyboard attempts to output data from the
buffer at 6 ms intervals (Figure 4-7).
. 6 ms |
|
| l
U
|
} | Read KBDATA ;
— —=}__|.—
|
|_|
r-4i1— The Unit Keeps >
1D
rot
The Level Low
Ld
\ Start Bit A
Figure 4-7 Sequence When KBDATA = L and KBCLK = H
When the buffer overflows (FF) HEX Is output at the 17th byte of the
buffer.
When KBDATA = H and KBCLK = L at the system unit:
When the system unit holds KBCLK to LOW for 67.5 ms or more, the
keyboard performs self test. (See also the section entitled "Self
Test.")
IV - 10