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ML9092-01TB 데이터시트(PDF) 50 Page - OKI electronic componets

부품명 ML9092-01TB
상세설명  LCD Driver with Key Scanner and RAM
PDF  66 Pages
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제조업체  OKI [OKI electronic componets]
홈페이지  http://www.oki.com
Logo OKI - OKI electronic componets

ML9092-01TB 데이터시트(HTML) 50 Page - OKI electronic componets

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FEDL9092-01
OKI Semiconductor
ML9092-01/02/03/04
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Functional Description of the Rotary Encoder Switch
As shown in Figure 3, the rotary encoder switch circuit is made up of phase detection circuit, an interrupt
generation circuit, an up/down counter and a parallel-in/serial-out register.
Phase detection circuit
UP DOWN
B
A
Up/down counter
Parallel in/serial out
shift register
Interrupt
generation circuit
To KREQ
Output data
Q4
Q3
Q2
Q1
Figure 3 Rotary Encoder Switch Circuit
1) Phase Detection and Interrupt Generation Circuits
1-1) Clockwise Rotation
When the A and B signals are input as shown in Figure 4, the phase detection circuit outputs the UP
signal after the chattering absorption period. At this time, the KREQ output goes to a high level, so
that this signal can be used as the interrupt signal. The KREQ signal maintains a high level until the
rotary encoder read instruction is executed.
UP (internal signal)
B
A
KREQ
Chattering absorption period
Figure 4 Input/Output Timing for Clockwise Rotation



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