參數(shù)資料
型號(hào)： SAA1575HL
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 通信及網(wǎng)絡(luò)
英文描述： Global Positioning System (GPS)baseband processor(通用定位系統(tǒng)基帶處理器)
中文描述： SPECIALTY TELECOM CIRCUIT, PQFP100
封裝： 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, SOT-407-1, LQFP-100
文件頁(yè)數(shù)： 16/56頁(yè)
文件大?。?/td> 744K
代理商： SAA1575HL
1999 Jun 04
16
Philips Semiconductors
Product specification
Global Positioning System (GPS)
baseband processor
SAA1575HL
7.5
CPU peripheral features
The SAA1575HL contains the hardware for 3 timers,
2 UARTs, a watchdog timer, a 3-bit RF IC programming
link and an 8-bit general purpose I/O port.
7.5.1
T
IMERS
/
COUNTERS
The SAA1575HL has 2 standard 16-bit timer/counters and
a third 16-bit up/down timer/counter. These timer/event
counters can perform the following functions:
Measure time intervals and pulse duration
Count external interrupts
Generate interrupt requests
Generate Pulse Width Modulation (PWM) or timed
output waveforms.
The timers are used by the standard Philips firmware to
generate the baud rates for the UART serial ports.
The additional features are not used in the standard
Philips firmware but are available for use in custom
firmware revisions.
All of the timers are configured in the 16-bit auto-reload
mode of operation. Timer 1 is used to generate the baud
rate for UART0 and Timer 2 is used to generate the baud
rate for UART1. In the standard Philips firmware, Timer 0
is not used.
7.5.2
W
ATCHDOG TIMER
The watchdog timer protects the system from incorrect
code execution by causing a processor reset if the
watchdog timer underflows as a result of a failure of the
firmware to feed the timer prior to it reaching its terminal
count.
In the standard Philips firmware, the watchdog is enabled
with a time-out period of 130 ms (at a clock frequency of
30 MHz).
7.5.3
UART
S
The SAA1575HL contains 2 UART ports, compatible with
the enhanced UART modes 1 to 3 on the 8xC51FB
(mode 0 operations not supported). With the exception of
the removal of the mode 0 operation, the UARTs in the
SAA1575HL are identical to those in the XA-G3 product.
Each UART rate is determined by either a fixed division of
the oscillator (in UART mode 2) or by one of the timer
overflow rates (in UART modes 1 and 3).
With the standard Philips firmware, both UARTs are
configured to be in Mode 1: variable rate 8-bit operation.
Ten bits are transmitted (via TXDn) or received
(via RXDn): a START bit, 8 data bits (LSB first), and a
STOP bit.
In general, the UART clocks (which are 16 times the baud
rate) are determined by the Timer 1 or Timer 2 overflow
rate. With the standard Philips firmware, Timer 1 is used to
generate the baud rate for UART0 and Timer 2 is used to
generate the baud rate for UART1. The baud rate is set to
be 4800 bits/s for both UARTs.
7.5.4
RF IC
PROGRAMMING PORT
The SAA1575HL is capable of programming the
UAA1570HL via a standard 3-wire serial link. This consists
of a clock line (SCLK), data line (D15 to D0) and a latch
enable (RFLE). Data is clocked into a holding register in
the UAA1570HL serially on each rising edge of the output
RFCLK. Once the complete serial packet has been
clocked into the RF IC, the latch enable output, RFLE, is
asserted which copies the new word from the holding
register in the RF IC into the control registers.
Proper timing of the clock, data and latch outputs is
ensured by firmware. An example sequence is illustrated
in Fig.7. The signals shown would result in the value 1001
being loaded into the last 4 bits of the RF IC serial register.
Each loading operation of the RF IC reloads the complete
RF control register.
With the standard Philips firmware, a 20-bit long word
0X5E320 is transmitted in this manner on start-up or
re-initialization. This gives full compatibility with the Philips
UAA1570HL front-end IC. See the “UAA1570HL”for more
details about the configuration options of the front-end IC.
相關(guān)PDF資料
PDF描述
SAA2023GP Drive processor for DCC systems
SAA2023 Drive processor for DCC systems
SAA2023H RES 4.53K OHM 1/16W 0.5% 0402SMD
SAA2500 MPEG Audio Source Decoder
SAA2500H MPEG Audio Source Decoder
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA158 制造商:SEMIKRON 制造商全稱(chēng):Semikron International 功能描述:Fast Avalanche Diodes
SAA159 制造商:SEMIKRON 制造商全稱(chēng):Semikron International 功能描述:Fast Avalanche Diodes
SAA160 制造商:SEMIKRON 制造商全稱(chēng):Semikron International 功能描述:Fast Avalanche Diodes
SAA16M8YX6XR4TL 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:DOUBLE DATA RATE (DDR) SDRAM
SAA16M8YX6XV4TL 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:DOUBLE DATA RATE (DDR) SDRAM
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠(chǎng)商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*