LC75742W 查看數據表（PDF） - SANYO -> Panasonic

零件编号

产品描述 (功能)

比赛名单

LC75742W

1/2 Duty VFD Driver with Key Input Function

SANYO -> Panasonic 

LC75742E, LC75742W

When the controller uses interrupt processing to read out the key data

• Flowchart

Wait period

(at least t10)

• Timing chart

Controller

determination

(Key on)

Controller Controller

determination determination

(Key off)

(Key on)

Controller

determination

(Key on)

Controller

determination

(Key on)

Controller

determination

(Key off)

t5.........Key scan execution time (25600T [s]) when the key data for two key scan operations matches.

t6 ........Key scan execution time (51200T [s]) when the key data for the first two key scan operations

............does not match.

t7......... Key address (8FH) transfer time

t8.........Key data readout time

T = 1 [s]

fOSC

• Operation

When the controller uses interrupt processing for key on/off determination and key data readout, it must check the state

of DO when CE is low, and perform a key data readout if DO is low. The next time the controller checks the on/off

states of the keys, it must make that determination at a time t10 after the last readout based on the state of DO when

CE is low, and then read out the key data. The time t10 must obey the following inequality:

t10 > t6

Note that if the controller reads out key data when DO is high, both the key data (KD1 to KD30) and the sleep

acknowledge data will be invalid data.

No. 6142-17/18

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