EM78P808 datasheet(39/63 Pages) EMC

39 / 63 page

EM78808

8-bit Micro-controller

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* This specification is subject to change without notice.

8/1/2004 (V3.1)

PAGE1 (PORT7 pull high control register)

PH77

PH76

PH75

PH74

PH73

PH72

PH71

PH70

Bit 0~Bit 7(PH70~PH77) : PORT7(0~7) pull high control register

disable pull high function.

enable pull high function

IOCB (PORTB I/O control, PORT6 pull high control)

PAGE0 (PORTB I/O control register)

IOCB7

IOCB6

IOCB5

IOCB4

IOCB3

IOCB2

IOCB1

IOCB0

Bit 0~Bit 7(IOCB0~IOCB7) : PORTB(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 (PORT6 pull high control register)

PH67

PH66

PH65

PH64

PH63

PH62

PH61

PH60

Bit 0~Bit 7(PH60~PH67) : PORT6(0~7) pull high control register

disable pull high function.

enable pull high function

IOCC (PORTC I/O control, TONE1 control)

PAGE0 (PORT9 I/O control register)

IOCC7

IOCC6

IOCC5

IOCC4

IOCC3

IOCC2

IOCC1

IOCC0

Bit 0~Bit 7(IOCC0~IOCC7) : PORTC(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 (TONE1 control register)

T17

T16

T15

T14

T13

T12

T11

T10

Bit 0~Bit 7(T10~T17) : Tone generator1‘s frequency divider and power control

Please Run in Normal mode .

Clock source = 111957Hz

T17~T10 = ‘11111111’

Tone generator1 will has 439(111957/N , N=255) Hz SIN wave output.

T17~T10 = ‘00000010’

Tone generator1 will has 55978(111957/N , N=2) Hz SIN wave output.

T17~T10 = ‘00000001’

DC bias voltage output

T17~T10 = ‘00000000’

Power off

Built-in tone generator can generate dialing tone signals for telephone of dialing tone type or just a single

tone. In DTMF application, there are two kinds of tone. One is the group of row frequency (TONE1), the other

is the group of column frequency (TONE2), each group has 4 kinds of frequency, user can get 16 kinds of

DTMF frequency totally. Tone generator contains a row frequency sine wave generator for generating the

DTMF signal which selected by IOCC page1 and a column frequency sine wave generator for generating the

DTMF signal which selected by IOCD page1. This block can generate single tone by filling one of these two

If all the values are low, the power of tone generators will turn off .

TONE2 (IOCD PAGE1) High group freq.

1203.8Hz

(0X5D)

1332.8Hz

(0X54)

1473.1Hz

(0X4C)

1646.4Hz

(0X44)

EM78P808 Datasheet(PDF) 39 Page - ELAN Microelectronics Corp

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