NJU6635 New Japan Radio Co.,Ltd, NJU6635 Datasheet - Page 23

• Manufacturer Part Number: NJU6635
• Description: 16-character 2-line Dot Matrix Lcd Controller Driver
• Manufacturer: New Japan Radio Co.,Ltd

(5)Interface with MPU
is available.
(4-1) Relation between oscillation frequency and LCD frame frequency.
(5-1)8-bit MPU interface
NJU6635 can be interfaced with both of 4/8 bit MPU and the two-time 4-bit or one-time 8-bit data transfer
1/16 duty
V
V
V
V
V
LCD
1
2
4
SS
Internal
Status
LCD frame frequency example mentioned below is based on 540kHz oscillation.
The clock for the LCD driving is using 270/2 kHz (1 clock = 1.852 s)
RS
R/W
E
DB
7
80 clock
1
Instruction
Writing
2
Data
3
1 frame
4
1 frame = 7.4 ( s) x 80 x 16 x 4 = 9.472(ms)
Frame frequency = 1/9.472(ms) = 105.6(Hz)
Busy Flag
Check
• • • • • •
Busy
Operation
16
1
Busy Flag
Check
Busy
2
3
1 frame
4
Busy Flag
Check
No
Busy
• • • • • •
16
Instruction
Writing
Data
1
NJU6635
2
3