參數(shù)資料
型號(hào)： SAA7705H
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Car radio Digital Signal Processor（DSP）(車載電臺(tái)數(shù)字信號(hào)處理器)
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP80
文件頁數(shù)： 23/60頁
文件大?。?/td> 1857K
代理商： SAA7705H
1999 Aug 16
23
Philips Semiconductors
Preliminary specification
Car radio Digital Signal Processor (DSP)
SAA7705H
Fig.11 Interface signals RDS decoder and microcontroller (buffer mode).
handbook, full pagewidth
MBH176
D0
D1
D2
D13
D14
D15
RDSDAT
RDSCLK
tw
tHC
tLC
block ready
start reading data
Tcy
8.10.4
B
UFFER INTERFACE
The RDS interface buffers 16 data bits. Every time 16 bits
are received, the data line is pulled LOW and the buffer is
overwritten. The microcontroller has to monitor the data
line in at most every 13.5 ms. This mode is selected by
setting the RDS-CLKIN bit of the RDSCTR register
(see Table 14) to logic 1. In Fig.11 the interface signals
from the RDS decoder and the microcontroller in buffer
mode are shown. When the buffer is filled with 16 bits the
data line is pulled LOW. The data line will remain LOW
until reading of the buffer is started by pulling the clock line
LOW. The first bit is clocked out. After 16 clock pulses the
reading of the buffer is ready and the data line is set HIGH
until the buffer is filled again. The microcontroller stops
communication by pulling the line HIGH. The data is
written out just after the clock HIGH-to-LOW transition.
The data is valid when the clock is HIGH.
When a new 16 bits buffer is filled before the other buffer
is read, that buffer will be overwritten and the old data is
lost.
8.11
DSP reset
Pin DSPRESET is active LOW and has an internal pull-up
resistor. Between this pin and pin V
SSD3V
a capacitor
should be connected to allow a proper switch-on of the
supply voltage. The capacitor value is such that the chip is
in reset state as long as the power supply is not stabilized.
A more or less fixed relationship between the DSPRESET
and the POM time constant is required. The voltage on the
pin POM determines the current flowing in the DACs.
When pin POM is at 0 V the DAC currents and output
voltages are zero; at V
DDA2
voltage the DAC currents are
at their nominal (maximum) value. Some time before the
QDAC outputs get to their nominal output voltages, the
DSP must be in working mode to reset the output register.
Therefore the DSP time constant must be less than the
POM time constant. For recommended capacitors,
see Figs 21 and 22.
The reset has the following functions:
The bits of the IAC control register are set to logic 0
The bits of the SEL register are set to their nominal
values
The DSP status registers are reset
The program counter is set to address 0000H
The two output flags in the status register are reset to
logic 0 (pins DSPOUT1 and DSPOUT2 are LOW).
When the level on pin DSPRESET is HIGH, the DSP
program starts to run.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA7706H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Car radio Digital Signal Processor (DSP)
SAA7706H/N107 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
SAA7706H/N107,518 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC DIRAC-1 RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
SAA7706H/N107,557 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC DIGITAL SIGNAL RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
SAA7706H/N107S,518 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC CAR RADIO DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
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