EM78P468NBQSSLASHNBQJ datasheet(42/82 Pages) EMC

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EM78P468N/L

8-Bit Microcontroller

•

Product Specification (V1.6) 12.31.2007

(This specification is subject to change without further notice)

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

LCDTYPE = “0”: “

A” type waveform

LCDTYPE = “1”: “

B” type waveform

Bits 1 ~ 0 (LCDF1 ~ LCDF0):

LCD frame frequency control bits

LCD Frame Frequency (e.g. Fs=32.768kHz)

LCDF1

LCDF0

1/2 Duty

1/3 Duty

1/4 Duty

Fs/(256

×2)=64.0

Fs/(172

×3)=63.5

Fs/(128

×4)=64.0

Fs/(280

×2)=58.5

Fs/(188

×3)=58.0

Fs/(140

×4)=58.5

Fs/(304

×2)=53.9

Fs/(204

×3)=53.5

Fs/(152

×4)=53.9

Fs/(232

×2)=70.6

Fs/(156

×3)=70.0

Fs/(116

×4)=70.6

Note:

Fs: sub-oscillator frequency

6.9.2 RA/LCD_ADDR (LCD Address)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

LCD_A4

LCD_A3

LCD_A2

LCD_A1

LCD_A0

Bits 7 ~ 5:

Not used, fixed to “0”

Bits 4 ~ 0 (LCDA4 ~ LCDA0):

LCD RAM address

RB (LCD Data Buffer)

(LCD Address)

Bits 7 ~4

Bit 3

(LCD_D3)

Bit 2

(LCD_D2)

Bit 1

(LCD_D1)

Bit 0

(LCD_D0)

Segmen

00H

−

SEG0

01H

−

SEG1

02H

−

SEG2

1DH

−

SEG29

1EH

−

SEG30

1FH

−

SEG31

Common

COM3

COM2

COM1

COM0

6.9.3 RB/LCD_DB (LCD Data Buffer)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

−

LCD_D 3

LCD_D 2

LCD_D 1

LCD_D 0

Bits 7 ~ 4:

Not used

Bit 3 ~ 0 (LCD_D3 ~ LCD_D0):

LCD RAM data transfer registers

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