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| 型号： | TMS320C542PGE-40 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 数字信号处理 |
| 英文描述： | 16-BIT, 100 MHz, OTHER DSP, PQFP144 |
| 封装： | PLASTIC, QFP-144 |
| 文件页数： | 37/111页 |
| 文件大小： | 1467K |
| 代理商： | TMS320C542PGE-40 |
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TMS320C54x, TMS320LC54x, TMS320VC54x
FIXED-POINT DIGITAL SIGNAL PROCESSORS
SPRS039C – FEBRUARY 1996 – REVISED DECEMBER 1999
31
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
serial ports (continued)
Table 3 provides a comparison of the serial ports available in the ’54x devices.
Table 3. Serial Port Configurations for the ’54x
DEVICE
NO. OF STANDARD
SERIAL PORTS
NO. OF BSPs
(BSP ADDRESS RANGES)
NO. OF TDM
SERIAL PORTS
TMS320C541
2
TMS320C541
TMS320LC541
2
–
TMS320C542
1 (0800h 0FFFh)
1
TMS320C542
TMS320LC542
–
1 (0800h – 0FFFh)
1
TMS320LC543
–
1 (0800h – 0FFFh)
1
TMS320LC545
1
1 (0800h 0FFFh)
TMS320LC545
TMS320LC545A
1
1 (0800h – 0FFFh)
–
TMS320LC546
1
1 (0800h 0FFFh)
TMS320LC546
TMS320LC546A
1
1 (0800h – 0FFFh)
–
TMS320LC548
–
2 (0800h – 0FFFh
and 1800h – 1FFFh)
1
TMS320LC549
TMS320VC549
–
2 (0800h – 0FFFh
and 1800h – 1FFFh)
1
hardware timer
The ’54x devices feature a 16-bit timing circuit with a four-bit prescaler. The timer counter is decremented by
one at every CLKOUT cycle. Each time the counter decrements to zero, a timer interrupt is generated. The timer
can be stopped, restarted, reset, or disabled by specific status bits.
clock generator
The clock generator provides clocks to the ’54x device, and consists of an internal oscillator and a phase-locked
loop (PLL) circuit. The clock generator requires a reference clock input, which can be provided by using a crystal
resonator with the internal oscillator, or from an external clock source. The reference clock input is then either
divided by two (or by four on the ’545A, ’546A, ’548, and ’549) to generate clocks for the ’54x device, or the PLL
circuit can be used to generate the device clock by multiplying the reference clock frequency by a scale factor,
allowing use of a clock source with a lower frequency than that of the CPU.
The PLL is an adaptive circuit that, once synchronized, locks onto and tracks an input clock signal. When the
PLL is initially started, it enters a transitional mode during which the PLL acquires lock with the input signal. Once
the PLL is locked, it continues to track and maintain synchronization with the input signal. Then, other internal
clock circuitry allows the synthesis of new clock frequencies for use as master clock for the ’54x device.
Two types of PLL are available: a hardware-programmable PLL and a software-programmable PLL. All ’54x
devices have the hardware-programmable PLL except the ’545A, ’546A, ’548, and ’549, which have the
software-programmable PLL. On the hardware-programmable PLL, an external delay must be provided before
the device is released from reset in order for the PLL to achieve lock. With the software-programmable PLL,
a lock timer is provided to implement this delay automatically. Note that both the hardware- and the
software-programmable PLLs require the device to be reset after power up to begin functioning properly.
hardware-programmable PLL
The ’54x can use either the internal oscillator or an external frequency source for an input clock. The clock
generation mode is determined by the CLKMD1, CLKMD2 and CLKMD3 clock mode pins except on the ’545A,
the ’546A, the ’548, and the ’549 (see software-programmable PLL description below). Table 4 outlines the
selection of the clock mode by these pins. Note that both the hardware- and the software-programmable PLLs
require the device to be reset after power up to begin functioning properly.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TMS320C54CST | 制造商:TI 制造商全称:Texas Instruments 功能描述:Client Side Telephony DSP |
| TMS320C54CSTGGU | 功能描述:数字信号处理器和控制器 - DSP, DSC DSP for Client-Side Telephony RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT |
| TMS320C54CSTPGE | 功能描述:数字信号处理器和控制器 - DSP, DSC DSP for Client-Side Telephony RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT |
| TMS320C54CSTZGU | 功能描述:数字信号处理器和控制器 - DSP, DSC DSP for Client-Side Telephony RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT |
| TMS320C54V90 | 制造商:TI 制造商全称:Texas Instruments 功能描述:EMBEDDED V.90 MODEM DSP |
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