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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： | 42/111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
36
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
switching from DIV mode to PLL mode (continued)
Once the PLLNDIV bit is set, the PLLCOUNT timer begins being decremented from its preset value. When the
PLLCOUNT timer reaches zero, the switch to PLL mode takes effect after six CLKIN cycles plus 3.5 PLL cycles
(CLKOUT frequency). When the switch to PLL mode is completed, the PLLSTATUS bit in the CLKMD register
is read as 1. Note that during the PLL lockup period, the ’54x continues operating in DIV mode.
The following software example shows an instruction that can be used to switch from DIV mode to PLL
3,
with a CLKIN frequency of 13 MHz and PLLCOUNT = 41 (decimal).
STM
#0010000101001111b, CLKMD
switching clock mode from PLL to DIV
When switching from PLL mode to DIV mode, the PLLCOUNT delay does not occur, and the switch between
the two modes takes place after a short transition delay.
The switch from PLL mode to DIV mode is also accomplished by loading the CLKMD register. The PLLNDIV
bit is set to 0, selecting DIV mode, and the PLLMUL bits are set to select the desired frequency multiplier as
shown in Table 5.
The switch to DIV mode takes effect in 6 CLKIN cycles plus 3.5 PLL cycles (CLKOUT frequency) for all PLLMUL
values except 1111b. With a PLLMUL value of 1111b, the switch to DIV mode takes effect in 12 CLKIN cycles
plus 3.5 PLL cycles (CLKOUT frequency). When the switch to DIV mode is completed, the PLLSTATUS bit in
the CLKMD register is read as 0.
The following software example shows a code sequence that can be used to switch from PLL
× 3 to
divide-by-two mode. Note that the PLLSTATUS bit is polled to determine when the switch to DIV mode has taken
effect, and then the STM instruction is used to turn off the PLL at this point.
STM
#0b, CLKMD
;switch to DIV mode
TstStatu:
LDM
CLKMD, A
AND
#01b, A
;poll STATUS bit
BC
TstStatu, ANEQ
STM
#0b, CLKMD
;reset PLLON_OFF when STATUS
;is DIV mode
switching mode from one PLL multiplier to another
When switching from one PLL multiplier ratio to another is required, the clock generator must be switched from
PLL mode to DIV mode before selecting the new multiplier ratio; switching directly from one PLL multiplier ratio
to another is not supported.
In order to switch from one PLL multiplier ratio to another, the following steps must be followed:
1.
Set the PLLNDIV bit to 0, selecting DIV mode.
2.
Poll the PLLSTATUS bit until a 0 is obtained, indicating that DIV mode is enabled and that PLLMUL, PLLDIV,
and PLLCOUNT can be updated.
3.
Modify the CLKMD register to set the PLLMUL[3–0], PLLDIV, and PLLNDIV bits to the desired frequency
multiplier as defined in Table 5, and the PLLCOUNT[7–0] bits to the required lock-up time.
When the PLLNDIV bit is set to one in step three, the PLLCOUNT timer begins decrementing from its preset
value. Once the PLLCOUNT timer reaches zero, the new PLL mode takes effect after six CLKIN cycles plus
3.5 PLL cycles (CLKOUT frequency).
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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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