UPD17073 NEC, UPD17073 Datasheet - Page 158

• Manufacturer Part Number: UPD17073
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
• Manufacturer: NEC

18. LCD CONTROLLER/DRIVER
signal and segment signal outputs.
18.1 Outline of LCD Controller/Driver
pins (COM0 through COM3) and segment signal output pins (LCD0 through LCD14).
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Remark LCDEN (bit 3 of LCD driver display start register: refer to Figure 18-6) turns ON/OFF all LCD display.
The LCD (Liquid Crystal Display) controller/driver can display an LCD of up to 60 dots by a combination of command
Figure 18-1 outlines the LCD controller/driver.
The LCD controller/driver can be used to display up to 60 dots by using a combination of common signal output
The drive mode is 1/4 duty, 1/2 bias, the frame frequency is 62.5 Hz, and drive voltage is V
REG
REG
CAP
CAP
LCD14 pin
COM0 pin
COM3 pin
LCD0 pin
LCD
LCD
LCD
LCD
0 pin
1 pin
0 pin
1 pin
Figure 18-1. Outline of LCD Controller/Driver
LCD drive voltage
generation block
Segment signal
output timing
control block
Common signal
output timing
control block
Basic clock for
timing control
LCD segment register
(data memory space)
LCDEN flag
LCD1
PD17072,17073
.