msm9223 Oki Semiconductor, msm9223 Datasheet - Page 18

• Manufacturer Part Number: msm9223
• Description: 27-bit Duplex/triplex Vfd Controller/driver With Digital Dimming, Adc And Keyscan
• Manufacturer: Oki Semiconductor

¡ Semiconductor
1) Phase detection
1-1) Clockwise
The input A and B have a chattering absorption circuit of 620ns (typ.). When signal A and B input
as fig. 2, the phase detection circuit outputs UP signal after the chattering absorption period. At
this time, the output INT also goes to high level, so this signal can be used as an interrupt. The
INT stays High level until the switch data-output mode is selected.
The rotary encoder switch function.
As figure 1 shows, the rotary encoder switch circuit is consisted of Phase detection, Interrupt
generation, Up/down counter, Direction latch and Parallel-in serial-out shift register.
A
B
UP (internal)
INT
chattering absorption time
Fig.2 The Input and Output Timing in Case of Clockwise.
UP/DOWN Counter
A
Phase Detection
P-in/S-out Shift Registor
UP
Q3 Q2 Q1
Fig.1 The Rotary Encoder Switch Circuit
DOWN
B
Direction Latch
R1
Generation
Interrupt
for INT
Output data
MSM9223
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