EM78P468NBQSSLASHNBQJ datasheet(16/82 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)

6.1.9 R8/Port 8 (Port 8 I/O Data Register)

(Address: 08h)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

R87

R86

R85

R84

R83

R82

R81

R80

Bits 7~0:

8-bit I/O registers of Port 8

User can use IOC80 register to define each bit either as input or output.

6.1.10 R9/LCDCR (LCD Control Register)

(Address: 09h)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

DS1

DS0

LCDEN

LCDTYPE

LCDF1

LCDF0

Bit 7 (BS):

LCD bias select bit,

BS = “0”:

1/2 bias

BS = “1”:

1/3 bias

Bit 6 ~ 5 (DS1 ~ DS0):

LCD duty select

DS1

DS0

LCD Duty

1/2 duty

1/3 duty

1/4 duty

Bit 4 (LCDEN):

LCD enable bit

LCDEN = “0”:

LCD circuit disabled. All common/segment outputs are set to

ground (GND) level.

LCDEN = “1”:

LCD circuit enabled.

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

EM78P468NBQS/NBQJ 数据表(PDF) 16 Page - ELAN Microelectronics Corp

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