參數(shù)資料
型號(hào)： TMS320LC542-40
元件分類： 數(shù)字信號(hào)處理
英文描述： Digital Signal Processor
中文描述： 數(shù)字信號(hào)處理器
文件頁(yè)數(shù)： 32/111頁(yè)
文件大?。?/td> 1426K
代理商： TMS320LC542-40
TMS320C54x, TMS320LC54x, TMS320VC54x
FIXED-POINT DIGITAL SIGNAL PROCESSORS
SPRS039C – FEBRUARY 1996 – REVISED DECEMBER 1999
32
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
hardware-programmable PLL (continued)
Table 4. Clock Mode Configurations
MODE-SELECT PINS
CLOCK MODE
CLKMD1
CLKMD2
CLKMD3
OPTION 1
OPTION 2
0
0
0
PLL
×
3 with external source
PLL
×
2 with external source
PLL
×
3, internal oscillator enabled
PLL
×
1.5 with external source
Divide-by-two with external source
Stop mode
PLL
×
1 with external source
Divide-by-two, internal oscillator enabled
PLL
×
5 with external source
PLL
×
4 with external source
PLL
×
5, internal oscillator enabled
PLL
×
4.5 with external source
Divide-by-two with external source
Stop mode
PLL
×
1 with external source
Divide-by-two, internal oscillator enabled
1
1
0
1
0
0
0
1
0
0
0
1
0
1
1
1
0
1
1
1
1
Option: Option 1 or option 2 is selected when ordering the device.
Stop mode: The function of the stop mode is equivalent to that of the power-down mode of IDLE3; however, the IDLE3 instruction is recommended
rather than stop mode to realize full power saving, since IDLE3 stops clocks synchronously and can be exited with an interrupt.
software-programmable PLL (’545A, ’546A, ’548, and ’549)
The software-programmable PLL features a high level of flexibility, and includes a clock scaler that provides
various clock multiplier ratios, capability to directly enable and disable the PLL, and a PLL lock timer that can
be used to delay switching to PLL clocking mode of the device until lock is achieved.
Devices that have a built-in software-programmable PLL can be configured in one of two clock modes:
PLL mode. The input clock (X2/CLKIN) is multiplied by 1 of 31 possible ratios. These ratios are achieved
using the PLL circuitry.
DIV (divider) mode. The input clock is divided by 2 or 4. Note that when DIV mode is used, the PLL can be
completely disabled in order to minimize power dissipation.
The software-programmable PLL is controlled using the 16-bit memory-mapped (address 0058h) clock mode
register (CLKMD). The CLKMD register is used to define the clock configuration of the PLL clock module. The
CLKMD register fields are shown in Figure 7 and described below. Note that upon reset, the CLKMD register
is initialized with a predetermined value dependent only upon the state of the CLKMD1 – CLKMD3 pins (see
Table 6).
Bit #
15–12
11
10–3
2
1
0
PLLMUL
R/W
PLLDIV
R/W
PLLCOUNT
R/W
PLLON/OFF
R/W
PLLNDIV
PLLSTATUS
R/W
R
R = read, W = write
When in DIV mode (PLLSTATUS is low), PLLMUL, PLLDIV, PLLCOUNT, and PLLON/OFF are don’t cares, and their contents are
indeterminate.
Figure 7. Clock Mode Control Register (CLKMD)
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TMS320LC542PBK2-50 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC Dig Signal Proc 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
TMS320LC542PGE1-40 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC Dig Signal Proc 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
TMS320LC542PGE1-50 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC Dig Signal Proc 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
TMS320LC542PGE2-40 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC Dig Signal Proc 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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