HT36B4 datasheet(18/38 Pages) HOLTEK

18 / 38 page

HT36B4

Rev. 1.00

October 18, 2006

D/A Converter Interface

HT36B4 provides the IIS serial data format to support the

multiple D/A converters, one bit clock output and a word

clock signal for left/right stereo serial data transmission.

Clock Signal

The bit clock output signals DCK are used to synchronize

the IIS serial data.

The word clock signal LOAD divides the serial data into

left channel and right channel data for two-way audio out-

put.

· LOAD

The word clock signal LOAD is used for IIS serial data.

The stereo serial data consists of 16-channel sound

generator.

· DOUT

On IIS format, a

²H² state on LOAD is used for the right

channel, and a

²L² state is used for the left channel.

· DCK

DCK bit clock is the clock source for the signal.

Stereo Serial Data Format

The audio output data is in serial mode with 16 bit digi-

tal signal and LSB first output. There is a high sam-

pling rate of 50kHz when the system clock is 12.8MHz

and with two channel outputs for Right/Left channel.

HT36B4 provides only one serial data format as IIS

mode. The user could directly connect a D/A converter

which can accept the IIS serial data format, like

HT82V731.

Mask Option

No. Mask Option

Function

WDT source

On-chip RC/Instruction clock/

disable WDT

CLRWDT

times

One time, two times

(CLR WDT1/WDT2)

Wake-up

PA only

Pull-High

PA, PB, PC, PD input

OSC mode

Crystal or Resistor type

I/O DAC pin

PD1~3 DAC pin selection

D O U T

D C K

L O A D

L S B

M S B

S a m p l e O u t

R i g h t

L e f t

D/A Converter Timing

A_R

ENV1

ENV0

Volume Control Bit

Control Bit Final Value

Mode

VL2~0, VR2~0

111b

Release mode

VL1~0, VR1~0

11b

VL0, VR0

No Bit

unchanged

No change mode

VL2~0, VR2~0

000b

Attach mode

VL1~0, VR1~0

00b

VL0, VR0

Envelope Type Definition

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