MSM9005-XX OKI [OKI electronic componets], MSM9005-XX Datasheet - Page 10

• Manufacturer Part Number: MSM9005-XX
• Description: DOT MATRIX LCD CONTROLLER WITH 8-DOT COMMON DRIVER AND 65-DOT SEGMENT DRIVER
• Manufacturer: OKI [OKI electronic componets]

¡ Semiconductor
FUNCTIONAL DESCRIPTION
General Description of Block Diagram
1. Address Pointer
2. Character Generator Address RAM (CGA RAM)
3. Arbitrator RAM (AB RAM)
4. Character Blink RAM (CHB RAM)
5. Arbitrator Blink RAM (ABB RAM)
6. Character Generator ROM (CG ROM)
Relationship between display screen, LCD output and memory address
Address
Screen
RAM
map
An address pointer is a 5-bit counter which assigns the write destination or read destination
address of CGA RAM and AB RAM, and the write destination address of CHB RAM and ABB
RAM. The value of the address pointer can be set by the LPA command. The value of the
address pointer is automatically incremented by 1 after executing the AINC and CHB
commands, or after transferring input display data.
The character generator address RAM stores 8-bit character codes of the character generator
ROM. A maximum of thirteen 8-bit character codes can be stored.
The arbitrator RAM stores the lighting data of the arbitrator. Lighting data is stored in 5 dot
units, and a maximum of 65 dots of lighting data can be stored.
The character blink RAM stores character blink data. A maximum of 13 characters of blink
data can be stored.
The arbitrator blink RAM stores blink data of the arbitrator. Blink data is stored in 5 dot units,
and a maximum of 65 dots of blink data can be stored.
The character generator ROM generates character patterns with 5 ¥ 7 dots. This ROM can store
a maximum of 256 types of characters, numerics, and symbols.
When an 8-bit character code of CG ROM is written to CGA RAM, character patterns with
5 ¥ 7 dots corresponding to 8-bit character code are displayed at the LCD display position
corresponding to the CGA RAM address.
Arbitrator
Character
Arbitrator
Character
S1
10000b
00000b
S5 S6
10001b
00001b
S10 S11
10010b
00010b
S15 S16
10011b
00011b
S20 S21
10100b
00100b
S25 S26
10101b
00101b
S30 S31
10110b
00110b
S35 S36
10111b
00111b
S40 S41
11000b
01000b
S45 S46
11001b
01001b
S50 S51
11010b
01010b
S55 S56
11011b
01011b
FEDL9005-03
MSM9005-xx
S60 S61
11100b
01100b
S65
10/30
C1
C2
C3
C4
C5
C6
C7
C8