EM78P808 datasheet(35/63 Pages) EMC

35 / 63 page

EM78808

8-bit Micro-controller

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* This specification is subject to change without notice.

8/1/2004 (V3.1)

Bit 3~Bit 4(LCDDV0~LCDDV1) : LCD driver’s driving ability control

LCDDV1

LCDDV0

Driving mode

Normal mode (ratio = 1)

Weak mode (ratio = 1/2)

Strong mode (ratio = 2)

Maximum mode (ratio = 4)

LCDDV0 ~ LCDDV1 are used to select the driving ability of LCD driver. The driving ability is Maximum

mode > Strong mode > Normal mode > Weak mode by 1/2 ratio individually. The larger driving ability it is

selected, the larger output loading of LCD driver output can be afforded and the more current consumption is

occurred. It depends on user’s application.

Bit 5(PBS) : Switch I/O PORTB or LCD segment output for share pins SEGxx/PBx

select normal PB0 ~ PB7 for PORTB

select SEG48 ~ SEG55 output for LCD SEGMENT output.

Bit 6(PCSL) : Switch low nibble I/O PORTC or LCD segment output for share pins SEGxx/PCx

select normal PC0 ~ PC3 for low nibble PORTC

select SEG56 ~ SEG59 output for LCD SEGMENT output.

Bit 7(PCSH) : Switch high nibble I/O PORTC or LCD segment output for share pins SEGxx/PCx

select normal PC4 ~ PC7 for high nibble PORTC

select SEG60 ~ SEG63 output for LCD SEGMENT output.

IOC7 (PORT7 I/O control, Key strobe(8~15))

PAGE0 (PORT7 I/O control register)

IOC77

IOC76

IOC75

IOC74

IOC73

IOC72

IOC71

IOC70

Bit 0~Bit 7(IOC70~IOC77) : PORT7(0~7) I/O direction control register

put the relative I/O pin as output

put the relative I/O pin into high impedance

PAGE1 (Key strobe control register)

STRB15

STRB14

STRB13

STRB12

STRB11

STRB10

STRB9

STRB8

Bit 0~Bit 7(STRB8~STRB15) : Key strobe control bits

These key strobe control registers correspond to SEGMENT8 to SEGMENT15. Please refer KEYSTOBE

explanation (RE page0).

IOC8 (PORT8 I/O control, , Key strobe(16~23))

PAGE0 (PORT8 I/O control register)

IOC87

IOC86

IOC85

IOC84

IOC83

IOC82

IOC81

IOC80

Bit 0~Bit 7(IOC80~IOC87) : PORT8(0~7) I/O direction control register

put the relative I/O pin as output

put the relative I/O pin into high impedance

PAGE1 (Key strobe control register)

STRB23

STRB22

STRB21

STRB20

STRB19

STRB18

STRB17

STRB16

Bit 0~Bit 7(STRB16~STRB23) : Key strobe control bits

These key strobe control registers correspond to SEGMENT16 to SEGMENT23. Please refer KEYSTOBE

explanation (RE page0).

EM78P808 Datasheet(PDF) 35 Page - ELAN Microelectronics Corp

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