EM78P468LAQ EMC [ELAN Microelectronics Corp], EM78P468LAQ Datasheet - Page 46

• Manufacturer Part Number: EM78P468LAQ
• Description: 8-BIT Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

EM78P468L
8-BIT Microcontroller
42 •
RA/LCD_ADDR (LCD Address)
RB/LCD_DB (LCD Data Buffer)
Bit 4 (LCDEN): LCD enable bit: 0/1 -> LCD circuit disable/enable
When 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
Bit 1 ~ 0(LCDF1 ~ LCDF0): LCD frame frequency control bits
Fs: sub-oscillator frequency
Bit 7 ~ 5: Not used, fixed to “0”
Bit 4 ~ 0 (LCDA4 ~ LCDA0): LCD RAM address
Bit 7 ~ 4: Not used
Bit 3 ~ 0 (LCD_D3 ~ LCD_D0): LCD RAM data transfer registers
(LCD address) Bit 7 ~4
LCDF1
Bit 7
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
|
LCDF0
Bit 6
Bit 6
0
--
0
1
0
1
--
--
--
--
--
--
X
Bit 5
Fs/(256*2)=64.0
Fs/(280*2)=58.5
Fs/(304*2)=53.9
Fs/(232*2)=70.6
Bit 5
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_A3
LCD_D 3 LCD_D 2 LCD_D 1 LCD_D 0
Bit 3
Fs/(172*3)=63.5
Fs/(188*3)=58.0
Fs/(204*3)=53.5
Fs/(156*3)=70.0
Bit 3
Product Specification (V1.0) 03.15.2006
(LCD_D1)
1/3 duty
COM1
Bit 1
LCD_A2
Bit 2
Bit 2
(LCD_D0)
COM0
Bit 0
LCD_A1
Fs/(128*4) =64.0
Fs/(140*4) =58.5
Fs/(152*4) =53.9
Fs/(116*4) =70.6
Bit 1
Bit 1
1/4 duty
Segment
SEG29
SEG30
SEG31
SEG0
SEG1
SEG2
LCD_A0
|
Bit 0
Bit 0