EM78P813

8-bit OTP Micro-controller

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* This specification is subject to change without notice.

31

2004/8/19

(V1.6)

Clock source = 85300Hz

T17~T10 = ‘11111111’

Tone generator1 will has 334(85300/255) Hz SIN wave output.

:

:

T17~T10 = ‘00000010’

Tone generator1 will has 41150(85300/2) 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 RA

page3 and a column frequency sine wave generator for generating the DTMF signal which selected by RB page3. This

block can generate single tone by filling one of these two register.

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

TONE2 (RB page3) High group freq.

1201.4Hz

(0X47)

1332.8Hz

(0X40)

1470.7Hz

(0X3A)

1640.4Hz

(0X34)

TONE1(RA page3)

699.2Hz(0x07A)

1

2

3

A

768.5Hz(0x06F)

4

5

6

B

Low group freq.

853.0Hz(0x064)

7

8

9

C

937.4Hz(0x05B)

*

0

#

D

Also TONE1 and TONE2 are an asynchronous tone generator so the both can be used to generate Caller ID FSK

signal. In FSK generator application, TONE1 or TONE2 can generate 1200Hz Mark bit and 2200Hz Space bit for

Bell202 or 1300Hz Mark bit and 2100Hz Space bit for V.23. See the following table.

TONE1(IOCC PAGE1) or

TONE2(IOCD PAGE1)

Freq. (Hz)

meaning

0x47

1201.4

Bell202 FSK Mark bit

0x27

2187.2

Bell202 FSK Space bit

0x42

1292.4

V.23 FSK Mark bit

0x29

2080.5

V.23 FSK Space bit

Tone generator can also generate CW or SMS signal. See the following table.

TONE1(IOCC PAGE1) or

TONE2(IOCD PAGE1)

Freq. (Hz)

meaning

0x28

2132.5

CAS freq

0x1F

2751.6

CAS freq

RB Port B I/O Data , LCD Data buffer , Key strobe , Tone 2 generator

PAGE0 Port B I/O Data

7

6

5

4

3

2

1

0

PB7

PB6

PB5

PB4

PB3

PB2

PB1

PB0

Bit 0 ~ Bit 7 (PB0 ~ PB7) : 8-bit PORTB ( 0~7 ) I/O data register

User can use IOC register to define input or output each bit.