HT95C30P datasheet(23/50 Pages) HOLTEK

23 / 50 page

HT95C200/20P/300/30P

Rev. 0.10

October 1, 2002

Preliminary

The flag DOUTC presents the output of the decoder

when the decoder is at operation mode. This data

stream is like the DOUT flag but does not include the al-

ternate 1 and 0 pattern.

If the FSK data is not detected, the DOUT and DOUTC

are held high.

Beside the serial data, the decoder also provides FSK

packet data. When decoder receives an FSK signal, it

will packet 10 bits data to 8 bits data, the first and 10th

bits will be discarded. When the 8-bit packet data is

valid, it will be stored in the FSK data register FSKD, the

FSK packet data interrupt flag FSKF will be set to 1. This

may cause a peripheral interrupt if FMSK is 0 and the

peripheral interrupt is enabled. The FSK packet source

could be DOUT or DOUTC, selected by FSKSEL. Note

that the start bit of the 10 packet bit should be 0, so the

MARK signal (one of the FSK data signals) will not be

packeted.

To detect the carrier signal or decode the serial data or

packet 10-bit data to 8-bit data, the operation mode of

the controller must be selected in Normal mode (proces-

sor running with 3.58MHz). When the operation mode is

Green or Sleep, FSK decoder will decode the wrong sig-

nal. However, when the operation mode is Green or

Sleep mode and the FSK decoder is at power down

mode (F_PWDN=1), the ring and line reversal detect is

still functional.

DTMF generator

The DTMF (Dual Tone Multiple-Frequency) signal gen-

erator is implemented in the telephone controller. It can

generate 16 dual tones and 8 single tones from the

DTMF pin. This generators also support power down,

tone on/off, burst mode function. The DTMF generator

clock source is 3.58MHz, before using this function, the

system operation mode must be at Normal mode.

The generator supports one interrupt source to the pe-

ripheral interrupt vector, namely DTMF burst-cycle inter-

rupt. Write 0 to the control flag, BMSK will enable this

interrupt. When the DTMF generator finishes 1

burst-cycle, the interrupt flag BURSTF will be set to 1 by

hardware even if the interrupt is disabled. This interrupt

will cause a peripheral interrupt if the peripheral interrupt

is enabled. When the peripheral interrupt occurs, the in-

terrupt request flag PERF will be set and a subroutine

call to location 10H will occur. Return from the interrupt

subroutine, the interrupt flag BURSTF will not be

cleared by hardware, the user could clear it by software

if necessary. If this flag is not cleared, next burst inter-

rupt will occur.

The power down mode (D_PWDN=1) will terminate all

the DTMF generator function, however, the registers

DTMFC and DTMFD are accessible at this power down

mode.

R i n g S i g n a l

0 1 0 1 0 1 . . . 1 1 1 1 1 . . .

. S K D A T A

* 5 5 . . . . . .

S y n c S i g n a l

M a r k S i g n a l

D A T A S i g n a l

8 - b i t P a c k e t e d . S K D A T A

C o o k e d D A T A

R a w D A T A

3 . 5 8 M H z

R D E T .

. _ P W D N

C L O C K

D O U T

D O U T C

. S K D a t a

2 S

0 . 5 S

C l e a r e d b y S o f t w a r e

t S U P D

S o f t w a r e C o n t r o l

Note: *: If the flag FSKSEL=1, the sync signal data will not be packeted.

HT95C30P Datasheet(PDF) 23 Page - Holtek Semiconductor Inc

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