MSM6262 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM6262

DOT MATRIX LCD CONTROLLER WITH 48-DOT COMMON DRIVER

Oki Electric Industry 

¡ Semiconductor

MSM6262-xx

9. LCD Display Circuit (COM1 to COM48, DO, CP, LOAD, DF)

The MSM6262-xx is provided with COMMON signal output. So, maximum 160 characters

can be displayed when it is used together with SEGMENT drivers (MSM5259 or MSM5839C).

Interface between MSM6262-xx and SEGMENT drivers can be done by using DO, CP, LOAD

and DF.

The SEGMENT data is serially output from DO pin, synchronized with the pulse which is

output from the CP pin.

This data, input to the SEGMENT driver, is converted from serial data to parallel data by the

latch pulse which is output from the LOAD pin of MSM6262-xx and this converted data is

used as the display data. This parallel/serial conversion is performed synchronized with the

COMMON signal of MSM6262-xx and LCD display AC signal which is output from DF pin.

So, this signal can drive dot matrix LCD panel.

10. Reset Circuit

Power-on-reset is required for MSM6262-xx when it is powered-on. So, a capacitor has to be

connected between RESET pin and VSS pin.

It is also advisable to connect a diode between RESET pin and VDD pin when it is required to

connect a capacitor of more than 3.3 µF to RESET pin.

When the power-on reset circuit normally operates, the busy flags 1 and 2 become at "H" level

for about 10 ms after the power-on. During this period, a initialization of MSM6262-xx is

performed by following procedures.

1 Display is cleared

2 CG ROM becomes enabled

3 No display shift

4 ADC is incremented

5 2-line display mode

6 5 x 8 dots font configuration

7 No display shift for "g", "j", "p", "q" and "y"

8 Display off

9 No display of cursor, blinking and underline

11. Data Bus with CPU

MSM6262-xx can be interfaced with 8-bit CPU, such as 6809, Z80, 80C49 and 80C51. When

MSM6262-xx is connected with 6809, the 68 series/80 series pin has to be connected to VDD.

When MSM6262-xx is connected with Z80, 80C49 or 80C51, the 68 series/80 series pin has to

be connected to VSS. The level at 68 series/80 series cannot be switched during MSM6262-xx's

operation. It must be connected with either VDD or VSS before MSM6262-xx is turned on.

Note: It is possible, indeed, to change the 68 series/ 80 series pin's level when a reset signal

is being input to RESET pin. However, the 68 series /80 series pin does not have

characteristics to have an interface with MCU, nor does it have an antichattering

circuit.

Further, if a reset signal is input, the MSM6262-xx is initialized as described above.

So, in this case, changing the 68 series/80 series pin level is not recommended.

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