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參數(shù)資料
| 型號： | HT36A0(48DIP) |
| 英文描述： | Microcontroller |
| 中文描述： | 微控制器 |
| 文件頁數(shù)： | 17/21頁 |
| 文件大?。?/td> | 229K |
| 代理商： | HT36A0(48DIP) |
HT36A0
Rev. 1.00
17
September 3, 2002
CH[3~0] channel number selection
The HT36A0 has a built-in 16 output channels and
CH[3~0] is used to define which channel is selected.
When this register is written to, the wavetable synthe-
sizer will automatically output the dedicated PCM
code. So this register is also used as a start playing
key and it has to be written to after all the other
wavetable function registers are already defined.
Change parameter selection
These two bits, VM and FR, are used to define which
register will be updated on this selected channel.
There are two modes that can be selected to reduce
the process of setting the register. Please refer to the
statements of the following table:
VM
FR
Function
0
0
Update all the parameter
0
1
Only update the frequency number
1
0
Only update the volume
Output frequency definition
The data on BL3~0] and FR[11~0] are used to define
the output speed of the PCM file, i.e. it can be used to
generate the tone scale. When the FR[11:0] is 800H
and BL[3:0] is 6H, each sample data of the PCM code
will be sent out sequentially.
When the f
OSC
is 12MHz, the formula of a tone fre-
quency is:
50kHz
FR [11~ 0]
f
OUT
= f
RECORD
SR
2
(17 BL [3~0])
where F
OUT
is the output signal frequency, F
RECORD
and SR is the frequency and sampling rate on the
sample code, respectively.
So if a voice code of C3 has been recorded which has
the F
RECORD
of 261Hz and the SR of 11025Hz, the tone
frequency (F
OUT
) of G3: F
OUT
=196Hz.
Can be obtained by using the fomula:
50kHz
196Hz= 261Hz
11025Hz
FR[11~ 0]
2
(17 BL [3~0])
A pair of the values FR[11~0] and BL[3~0] can be de-
termined when the f
OSC
is 12MHz.
Start address definition
The HT36A0 provides two address types for extended
use, one is the program ROM address which is pro-
gram counter corresponding with PF value, the other
is the start address of the PCM code.
The ST[15~0] is used to define the start address of
each PCM code and reads the waveform data from
this location. The HT36A0 provides 16 input data lines
from WA[15~0], the ST[15~0] is used to locate the
major 16 bits i.e. WA[15~5] and the undefined data
from WA[4~0] is always set as 00000b. In other
words, the WA[15~0]=ST[15~0] 2
5
. So each PCM
code has to be located at a multiple of 32. Otherwise,
the PCM code will not be read out correctly because it
has a wrong start code.
Waveform format definition
The HT36A0 accepts two waveform formats to ensure
a more economical data space. WBS is used to define
the sample format of each PCM code.
WBS=0 means the sample format is 8-bit
WBS=1 means the sample format is 12-bit
The 12-bit sample format allocates location to each
sample data. Please refer to the waveform format
statement as shown below.
Repeat number definition
The repeat number is used to define the address
which is the repeat point of the sample. When the re-
peat number is defined, it will be output from the start
code to the end code once and always output the
range between the repeat address to the end code
(80H) until the volume become close.
The RE[14~0] is used to calculate the repeat address
of the PCM code. The process for setting the
RE[14~0] is to write the 2 s complement of the repeat
length to RE[14~0], with the highest carry ignored.
The HT36A0 will get the repeat address by adding the
RE[14~0] to the address of the end code, then jump to
the address to repeat this range.
Left and Right volume control
The HT36A0 provides the left and right volume control
independently. The left and right volume are con-
trolled by VL[9~0] and VR[9~0] respectively. The chip
provides 1024 levels of controllable volume, the 000H
is the maximum and 3FFH is the minimum output vol-
ume.
Envelope type definition
The HT36A0 provides a function to easily program the
envelope by setting the data of ENV[1~0] and A_R. It
forms a vibrato effect by a change of the volume to at-
tach and release alternately.
TheA_Rsignalisusedtodefinethevolumechangein
attachmodeorreleasemodeandENV[1~0]isusedto
define which volume control bit will be changeable.
On the attach mode, the control bits will be sequen-
tially signaled down to 0. On the release mode, the
control bits will be sequentially signaled up to 1. The
relationship is shown in the following table.
#
6 #
4 #
#
7 #
8 #
3 #
9 #
:
(
6 (
6 :
6
4 :
4
0
'
!
; #
<
=
9 . #
6 . #
4 (
>
: :
!
< <
< <
( (
%
< <
0
'
!
Waveform format
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相關(guān)代理商/技術(shù)參數(shù) |
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| HT36A4_07 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Music Synthesizer 8-Bit MCU |
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