MSM6562B 查看數據表（PDF） - Oki Electric Industry

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MSM6562B

DOT MATRIX LCD CONTROLLER DRIVER

Oki Electric Industry 

¡ Semiconductor

MSM6562B-xx

7. Character Generator RAM (CG RAM)

The CG RAM is used to display user's original character patterns other than those stored in the

CG ROM.

The CG RAM has the capacity (64 bytes = 512 bits) to write 8 kinds for 5 ¥ 7 dots or 4 kinds for

5 ¥ 10 dots.

When displaying character patterns stored in the CG RAM, write 8-bit character codes (00 to 07

or 08 to 0F; hex.) shown on the left in Table 2 to the DD RAM. It is then possible to output the

character pattern to the LCD display position corresponding to the DD RAM address.

The following is a description on how to write and read character patterns to and from the CG

RAM.

(1) When the character pattern is 5 ¥ 7 dots (see Table 3)

• Method of writing character pattern into the CG RAM by the CPU :

The CG RAM address bits 0 to 2 correspond to the line position of the character pattern.

First, set increment or decrement by the CPU, and then input the CG RAM address.

After this, write character pattern into the CG RAM through DB0 to DB7 line by line.

DB0 to DB7 correspond to the CG RAM data bits 0 to 7 in Table 3.

The display of the character pattern is turned on when "H" is set as input data, while it is

turned off when "L" is set as the input data.

Since the ADC is automatically incremented or decremented by 1 after writing the data

to the CG RAM, it is not necessary to set the CG RAM address again.

When performing a cursor indication, set to "0" all the input data for the line the CG RAM

address bits 0 to 2 of which are all "1".

Although the CG RAM data bits 0 ~ 4 are output to the LCD as display data, the CG RAM

data bits 5 ~ 7 are not. It is possible, however, to use the CG RAM as a data RAM.

• Method of displaying the CG RAM character pattern to the LCD :

The CG RAM is selected when high-order 4 bits of the character code are all "L".

Since bit 3 of the character code is invalid, the display of "0" in Table 3 is selected by

character code "00" or "08" (hex.). When the 8-bit character code of the CG RAM is written

to the DD RAM, the character pattern of the CG RAM is displayed on the LCD display

position corresponding to the DD RAM address. (DD RAM data bits 0 to 2 correspond to

CG RAM address bits 3 to 5.)

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