- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄300163 > Z8913820FSC (ZILOG INC) 8-BIT, 20.48 MHz, MIXED DSP, PQFP100 PDF資料下載
參數(shù)資料
| 型號： | Z8913820FSC |
| 廠商： | ZILOG INC |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 8-BIT, 20.48 MHz, MIXED DSP, PQFP100 |
| 封裝： | QFP-100 |
| 文件頁數(shù)： | 47/65頁 |
| 文件大?。?/td> | 2054K |
| 代理商： | Z8913820FSC |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁當(dāng)前第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁
Z89138/Z89139
Zilog
Voice Processing Controllers
DS97TAD0201
P R E L I M I N A R Y
51
1
Pulse Width Modulator (PWM)
The PWM supports two different sampling rates (10 and 16
kHz), according to the settings of bit 8 of the ACR. The out-
put of the PWM can be assigned to logic 1 only during the
active region (which is 4/5 of the output signal period). The
output will be at logic 0 for the rest of the time. An excep-
tion occurs in 10 kHz PWM, where the active region covers
the whole output signal period (Figure 39). The active re-
gion is divided into 1024 time slots. In each of these time
slots, the output can be set to logic 1 or logic 0.
In order to increase the effective sampling rate, the PWM
employs a special technique of distributing the “l(fā)ogic 1” pe-
riod over the active region.
The 10-bit PWM data is divided into two parts: the upper
five bits (High_Val) and the lower five bits (Low_Val). The
1024 time slots in the active region are divided into 32
equal groups, with 32 time slots in each group. The first
slot of each of the 32 groups represents Low_Val, while
High_Val is represented by the remaining 31 time slots in
each group.
For example, a value of %13a is loaded into PWM data
register EXT 5:
%13a = 01 0011 1010B = 314
High_Val = 01001B = 9
Low_Val = 11010B = 26
26 out of 32 groups will then have their first slots set to log-
ic 1. The remaining one slot in each group has nine time
slots set to logic 1.
For 10 kHz PWM, the effective output frequency is 10K x
32 = 320 kHz. Figure 40 illustrates the waveform by using
a 6-bit PWM data (3-bit High_Val and 3-bit Low_Val).
Figure 38. PWM Waveform (shaded area shows the active region)
10 kHz
16 kHz
250
s
100
s
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| Z9025106PSC | 8-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDIP42 |
| ZADM023H151.0012 | PROXIMITY SENSOR-PHOTOELECTRIC, 150-150mm, 4-20mA, RECTANGULAR, BOARD MOUNT |
| ZADM023H300.0002 | PROXIMITY SENSOR-PHOTOELECTRIC, 30-30mm, 4-20mA, RECTANGULAR, BOARD MOUNT |
| ZADM023H351.0001 | PROXIMITY SENSOR-PHOTOELECTRIC, 350-350mm, 4-20mA, RECTANGULAR, BOARD MOUNT |
| ZADM023H351.0011 | PROXIMITY SENSOR-PHOTOELECTRIC, 350-350mm, 4-20mA, RECTANGULAR, BOARD MOUNT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| Z8913829ASC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| Z8913829FSC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| Z89139 | 制造商:ZILOG 制造商全稱:ZILOG 功能描述:Voice Processing Controllers |
| Z8913920ASC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| Z8913920FSC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。