em78p468l ELAN Microelectronics Corp, em78p468l Datasheet - Page 42

• Manufacturer Part Number: em78p468l
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

EM78P468N/EM78P468L
8-Bit Microcontroller
36 •
6.9.2 RA/LCD_ADDR (LCD Address)
6.9.3 RB/LCD_DB (LCD Data Buffer)
When the LCD function is disabled, all common/segment output is set to ground (GND)
level
Bit 3: Not used
Bit 2 (LCDTYPE): LCD drive waveform type select bit
Bits 1 ~ 0 (LCDF1 ~ LCDF0): LCD frame frequency control bits
Note: Fs: sub-oscillator frequency
Bits 7 ~ 5: Not used, fixed to “0”
Bits 4 ~ 0 (LCDA4 ~ LCDA0): LCD RAM address
Bits 7 ~ 4: Not used
Bit 3 ~ 0 (LCD_D3 ~ LCD_D0): LCD RAM data transfer registers
(LCD Address) Bits 7 ~4
Bit 7
LCDF1
−
Bit 7
Common
0
0
0
1
1
1DH
1EH
00H
01H
02H
1FH
LCDTYPE = “0”: “ A” type waveform
LCDTYPE = “1”: “ B” type waveform
RA
|
Bit 6
LCDF0
Bit 6
−
0
0
1
0
1
X
−
−
−
−
−
−
Bit 5
Bit 5
−
Fs/(256×2)=64.0
Fs/(280×2)=58.5
Fs/(304×2)=53.9
Fs/(232×2)=70.6
0
(LCD_D3)
COM3
1/2 Duty
Bit 3
−
−
−
−
−
−
RB (LCD Data Buffer)
LCD Frame Frequency (e.g. Fs=32.768kHz)
LCD_A4
Bit 4
Bit 4
−
(This specification is subject to change without further notice)
(LCD_D2)
COM2
Bit 2
−
−
−
−
−
−
|
LCD_D 3
LCD_A3
Bit 3
Bit 3
Fs/(172×3)=63.5
Fs/(188×3)=58.0
Fs/(204×3)=53.5
Fs/(156×3)=70.0
Product Specification (V1.5) 02.15.2007
(LCD_D1)
1/3 Duty
COM1
Bit 1
−
−
−
−
−
−
LCD_D 2
LCD_A2
Bit 2
Bit 2
(LCD_D0)
COM0
Bit 0
−
−
−
−
−
−
LCD_D 1
LCD_A1
Bit 1
Bit 1
Fs/(128×4)=64.0
Fs/(140×4)=58.5
Fs/(152×4)=53.9
Fs/(116×4)=70.6
1/4 Duty
Segment
SEG29
SEG30
SEG31
SEG0
SEG1
SEG2
LCD_D 0
LCD_A0
Bit 0
|
Bit 0