ML9092-01TB 查看數據表（PDF） - LAPIS Semiconductor Co., Ltd.

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ML9092-01TB

LCD Driver with Key Scanner and RAM

LAPIS Semiconductor Co., Ltd. 

LAPIS Semiconductor

FEDL9092-01

ML9092-01/02/03/04

1-2) Counterclockwise Rotation

When the A and B signals are input as shown in Figure 4, the phase detection circuit outputs the

DOWN 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.

A

B

Chattering absorption period

DOWN (internal signal)

KREQ

Figure 5 Input/Output Timing for Counterclockwise Rotation

2) UP/DOWN Counter

The UP/DOWN counter is incremented when an UP signal is input and decremented when a DOWN

signal is input. However, if the counter reaches “0111” and an UP signal is input, the UP/DOWN

counter will hold “0111”. In the same manner, if the UP/DOWN counter is at “1000” and a DOWN

signal is input, the UP/DOWN counter will hold “1000”.

A

B

Q4, Q3, Q2, Q1

0001 0010

0011 0100

0101 0110

Figure 6 When the Up Counter Overflows

0111 0111

A

B

Q4, Q3, Q2, Q1 1111

1110

1101

1100 1011

1010

Figure 7 When the Down Counter Overflows

1001

1000 1000

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