HT95R35 datasheet(55/73 Pages) HOLTEK

55 / 73 page

HT95R35

Rev. 1.00

October 7, 2009

PFD Data Register

Bit No.

Label

R/W

Function

7~0

PFD data register

PFDD (2FH) Register

PFD_Output_Frequency=

Prescaler_Output

2x(N 1)

, where N = the value of the PFD Data

RTC Function

When RTC 1000ms time-out occurs, the hardware will set the interrupt request flag RTCF and the RTCTO flag to

²1².

When the interrupt service routine is serviced, the interrupt request flag (RTCF) will be cleared to 0, but the flag RTCTO

remains in its original values. This bit (RTCTO) should be cleared only by software. However, next RTC interrupt will

still occur, even though the RTCTO flag is not cleared.

R T C C R e g i s t e r

b 0

N o t i m p l e m e n t e d , r e a d a s " 0 "

b 7

R T C F u n c t i o n E n a b l e

1 : e n a b l e

0 : d i s a b l e

R T C T i m e - o u t F l a g

1 : R T C t i m e - o u t o c c u r s

0 : R T C t i m e - o u t d o e s n o t o c c u r

R T C E N

N o t i m p l e m e n t e d , r e a d a s " 0 "

R T C T O

Voice Output

Voice Control

The voice control register controls the DAC circuit. If the

DAC circuit is not enabled, any DAH/DAL outputs will be

invalid. Selection the configuration option of PC1/AUD

for DAC audio output first and writing a

²1² to the

DACEN bit will enable the DAC circuit, while writing a

²0² to the DAC bit will disable the DAC circuit.

Audio Output and Volume Control

DAL, DAH, VOL, VOICEC

The audio output is 12-bits wide whose highest 8-bits

are written into the DAH register and whose lowest four

bits are written into the highest four bits of the DAL regis-

ter. Bits 0~3 of the DAL register are always read as zero.

There are 8 levels of volume which are setup using the

VOL register. Only the highest 3-bits of this register are

used for volume control, the other bits are not used and

read as zero.

V O I C E C R e g i s t e r

b 0

b 7

D A C E N

D A C E n a b l e

1 : e n a b l e

0 : d i s a b l e

N o t i m p l e m e n t e d , r e a d a s " 0 "

VOICE Control Register

D A L R e g i s t e r

b 7

b 0

N o t u s e d , r e a d a s " 0 "

D 3

D 2

D 1

D 0

A u d i o o u t p u t

Digital to Analog Data Low Register

D A H R e g i s t e r

b 7

b 0

D 1 1 D 1 0 D 9

D 8

A u d i o o u t p u t

D 7

D 6

D 5

D 4

Digital to Analog Data High Register

V O L R e g i s t e r

b 7

b 0

N o t u s e d , r e a d a s " 0 "

D A v o l u m e c o n t r o l d a t a

V O L 2 V O L 1 V O L 0

Volume Control Register

HT95R35 Datasheet(PDF) 55 Page - Holtek Semiconductor Inc

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