Fostex G16 - Page 15

When the digit is on (HIGH), segments at LOW will be lit and those at HIGH will not be
lit.
Fig. 3.5 Dynamic scan, LED
2) Switch
The switch ON/OFF information is also input in dynamic scan.
Regardless to switch position, HIGH level will be input to the KEY ports when the DIGIT
is OFF (LOW).
When the DIGIT is switched ON (HIGH), the KEY port whose switch is ON (closed) will
be input with a LOW level and the port whose switch is OFF (open) with a HIGH level.
Then, the digit will be sequentially switched ON in order ofl-*2-*....-»12->l -* 2 ->
. . . . 12 1 -> 2 ....
The switch ON/OFF information are thus input sequentially .
13