HT36B2 datasheet(18/39 Pages) HOLTEK

18 / 39 page

HT36B2

Rev. 1.10

March 10, 2005

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

· The PCM code definition

The HT36B2 can provide the voice format of the

signed 8-bit raw PCM. And the MCU will take the

voice code 80H as the end code.

So each PCM code section must be ended with the

end code 80H.

Digital to Analog Converter (DAC)

The HT36B2 provides two 16-bit current type DAC de-

vice controlled by the MCU or wavetable synthesizer for

driving the external speaker through an external NPN

transistor. It is in fact an optional object used for the

wavetable synthesizer DAC or general DAC, this is cho-

sen by mask option and DAC control register. If general

DAC is chosen for application, then the wavetable

synthesizer is disabled because the DAC is taken up

and controlled by the MCU. If general DAC is selected,

the programmer must write the voice data to register the

DAL and DAH to get the corresponding analog data.

For mask option enable DAC register and enable

SELWL and SELWR, then the table becomes useful.

Bit No.

Label

Function

SELWR

SELWR=1: Right channel DAC

data from wavetable

SELWR=0: Right c0hannel DAC

data from MCU (default)

DAON

DAON=1: DAC On

DAON=0: DAC Off (default)

SELWL

SELWL=1: Left channel DAC

data from wavetable

SELWL=0: Left channel DAC

data from MCU (default)

3~7

Unused bit, read as

²0²

DAC (1FH) Control Register

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

LVR/LVD

Low voltage detection

HT36B2 Datasheet(PDF) 18 Page - Holtek Semiconductor Inc

HT36B2 Datasheet(HTML) 18 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

Datasheet Download

Link URL