MSM6222B 查看數據表（PDF） - Oki Electric Industry

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MSM6222B

DOT MATRIX LCD CONTROLLER WITH 16-DOT COMMON DRIVER AND 40-DOT SEGMENT DRIVER

Oki Electric Industry 

¡ Semiconductor

MSM6222B-xx

Differences Between HD44780 and MSM6222B-xx

Item

LCD driving voltage (VLCD)

1/4 bias

1/5 bias

Bus interface speed with CPU

The increment and decrement

of the address counter in writing/

reading the data to/from the

CGRAM/DDRAM.

The repeated input frequency

(oscillation frequency=250kHz)

of display clear instruction

HD44780

3.0 to 11.0 (V)

4.6 to 11.0 (V)

1 MHz (1000 ns)

The address counter is incremented

or decremented 6 msec

(when ƒOSC = 250 KHz) after the

busy condition is released.

(Period of busy condition is 40 ms)

So, the data cannot be written into/

read out from the RAM for 6 msec

after the busy condition was over.

610 Hz or less (1.64 ms or more)

MSM6222B - xx

3.0 to 8.0 (V)

3.0 to 8.0 (V)

1.5 MHz (667 ns)

Since signal rise/fall time is quite fast,

the electromagnetic induction between

lines of the PCB and the cable

assignment should be noted.

The address counter is incremented

or decremented during the busy

condition.

So, data can be written into/read out

from the RAM immediately after the

busy condition was over.

78 Hz or less in 5¥7 dots (12.8 ms or

more), 56Hz or less in 5¥10 dots (17.9

ms or more)

43/45

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