em78p468n ELAN Microelectronics Corp, em78p468n Datasheet - Page 43

• Manufacturer Part Number: em78p468n
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.6) 12.31.2007
(This specification is subject to change without further notice)
6.9.4 RD/SBPCR (System, Booster and PLL Control Registers)
Bit 2 ~ 1 (BF1 ~ 0): LCD booster frequency select bits
The initial setting flowchart for LCD function
Bit 7
*Set Port 7 snd Port 8 for general I/O or LCD segment (IOC50)
*it must be set to output port w hen the pin of port 7 and the pin of port 8 for LCD
segemnt (IOC70 and IOC80)
Set LCD Type, duty, bias, LCD frame frequency (R9)
Set LCD Booster Frequency (RD)
Clear all LCD RAM (RA and RB)
Enable LCD function (R9)
Use LCD address and LCD data buffer to implment user's applications. (RA and RB)
−
BF1
0
0
1
1
CLK2
Bit 6
Fig.6-14 The Initial Setting Flowchart for LCD Function
BF0
0
1
0
1
CLK1
Bit 5
IC RESET occur
Booster Frequency
CLK0
Bit 4
END
Fs/16
Fs/4
Fs/8
Fs
IDLE
Bit 3
Bit 2
BF1
8-Bit Microcontroller
Bit 1
EM78P468N/L
BF0
CPUS
Bit 0
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