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38D2 Datasheet(PDF) 126 Page - Renesas Technology Corp

Part # 38D2
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PDF  136 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

38D2 Datasheet(HTML) 126 Page - Renesas Technology Corp

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Rev.3.02
Apr 10, 2008
Page 126 of 131
REJ03B0177-0302
38D2 Group
Notes on LCD Drive Control Circuit
1. Setting Data to LCD Display RAM
To write data to the LCD display RAM when the LCD enable bit
is set to “1” and while LCD is turned on, set fixed data.
Rewriting with temporary data may cause LCD to flicker. The
following shows a processing example to write data to the LCD
display RAM while LCD is turned on.
Fig. 104 Processing example when writing data to LCD display RAM While LCD Turned On
(1) Ccorrect processing
LCD
on
LCD
on or
off
*Content at address 004016: “FF16”
Off
On
Set LCD display RAM data
LRAM0 (address 004016) ← “FF16”
LCD on or off?
Set LCD display RAM data
LRAM0 (address 004016) ←“0016”
・
Set fixed data to LCD display RAM
(2) Incorrect processing
LCD
on
LCD
on or
off
*Content at address 004016: “FF16”
Off
On
Set LCD display RAM data
LRAM0 (address 004016) ← “FF16”
LCD on or off?
Set LCD display RAM data
LRAM0 (address 004016) ←“0016”
・
Set off data to LCD display RAM
LCD
off
・
Set fixed data to LCD display RAM



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