Sharp R-32STM Bedienungsanleitung PDF herunterladen (Seite 6)

TC2004A-01

Ver.V00 2009-07-07 www.tinsharp.com

- 6 -

CONNECTION WITH MCU

(1) Typical V0 connections for display contrast

Adjust V0 to VDD (VLCD= 4.7V) as an initial setting. When the module is operational, readjust V0 for optimal

display appearance.

We recommend allowing field adjustment of V0 for all designs. The optimal value for V0 will change with

temperature, variations in VDD, and viewing angle. V0 will also vary module-to-module and batch-to-batch due

to normal manufacturing variations.

Ideally, adjustment to V0 should be available to the end user so each user can adjust the display to the optimal

contrast for their required viewing conditions. As a minimum, your design should allow V0 to be adjusted as part

of your product’s final test.

Although a potentiometer is shown as a typical connection, V0 can be driven by your microcontroller, either by

using a DAC or a filtered PWM. Displays that require V0 to be negative may need a level-shifting circuit. Please

do not hesitate to contact Tinsharp application support for design assistance on your application.

(2) MPU Interface 4-bit/8-Bit

There are tow types of data operations: 4-bit and 8-bit operations. Using 4-bit MPU, the interfacing 4-bit data is

transferred by 4-busline (DB4～DB7). Thus, DB0 to DB3 bus lines are not used. Using 4-bit MPU to interface

8-bit data requires tow times transferring. First, the higher 4-bit data is transferred by 4-busline (for 8-bit

operation, DB7～DB4). Secondly, the lower 4-bit data is transferred by 4-busline (for 8-bit operation, DB3～

DB0). For 8-bit MPU, the 8-bit data is transferred by 8-busline (DB0～DB7).

VDD

VSS

100～50

LCD

VDD

VSS

VDD

VSS

DB0-DB7

R/W

P3.0

P3.1

P3.2

MCU

VR: 100~50K

VDD

LCD MODULE

TC2004A-01

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Sharp R-32STM Bedienungsanleitung Seite 6