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| 型號： | TMS320F28044PZQ |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | Digital Signal Processor |
| 中文描述： | 數(shù)字信號處理器 |
| 文件頁數(shù)： | 26/105頁 |
| 文件大?。?/td> | 768K |
| 代理商： | TMS320F28044PZQ |
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A
3.2.10
Peripheral Interrupt Expansion (PIE) Block
3.2.11
External Interrupts (XINT1, XINT2, XNMI)
3.2.12
Oscillator and PLL
3.2.13
Watchdog
3.2.14
Peripheral Clocking
3.2.15
Low-Power Modes
TMS320F28044
Digital Signal Processor
SPRS357A–AUGUST 2006–REVISED OCTOBER 2006
The PIE block serves to multiplex numerous interrupt sources into a smaller set of interrupt inputs. The
PIE block can support up to 96 peripheral interrupts. On the 28044, 43 of the possible 96 interrupts are
used by peripherals. The 96 interrupts are grouped into blocks of 8 and each group is fed into 1 of 12
CPU interrupt lines (INT1 to INT12). Each of the 96 interrupts is supported by its own vector stored in a
dedicated RAM block that can be overwritten by the user. The vector is automatically fetched by the CPU
on servicing the interrupt. It takes 8 CPU clock cycles to fetch the vector and save critical CPU registers.
Hence the CPU can quickly respond to interrupt events. Prioritization of interrupts is controlled in
hardware and software. Each individual interrupt can be enabled/disabled within the PIE block.
The 28044 device supports three masked external interrupts (XINT1, XINT2, XNMI). XNMI can be
connected to the INT13 or NMI interrupt of the CPU. Each of the interrupts can be selected for negative,
positive, or both negative and positive edge triggering and can also be enabled/disabled (including the
XNMI). The masked interrupts also contain a 16-bit free running up counter, which is reset to zero when a
valid interrupt edge is detected. This counter can be used to accurately time stamp the interrupt. Unlike
the 281x devices, there are no dedicated pins for the external interrupts. Rather, any Port A GPIO pin can
be configured to trigger any external interrupt.
The 28044 can be clocked by an external oscillator or by a crystal attached to the on-chip oscillator circuit.
A PLL is provided supporting up to 10 input-clock-scaling ratios. The PLL ratios can be changed on-the-fly
in software, enabling the user to scale back on operating frequency if lower power operation is desired.
Refer to the Electrical Specification section for timing details. The PLL block can be set in bypass mode.
The 28044 device contains a watchdog timer. The user software must regularly reset the watchdog
counter within a certain time frame; otherwise, the watchdog will generate a reset to the processor. The
watchdog can be disabled if necessary.
The clocks to each individual peripheral can be enabled/disabled so as to reduce power consumption
when a peripheral is not in use. Additionally, the system clock to the serial ports (except I
2
C) and the ADC
blocks can be scaled relative to the CPU clock. This enables the timing of peripherals to be decoupled
from increasing CPU clock speeds.
The 28044 device is full static CMOS devices. Three low-power modes are provided:
IDLE:
Place CPU into low-power mode. Peripheral clocks may be turned off selectively and only
those peripherals that need to function during IDLE are left operating. An enabled interrupt
from an active peripheral or the watchdog timer will wake the processor from IDLE mode.
Turns off clock to CPU and peripherals. This mode leaves the oscillator and PLL functional.
An external interrupt event will wake the processor and the peripherals. Execution begins
on the next valid cycle after detection of the interrupt event
Turns off the internal oscillator. This mode basically shuts down the device and places it in
the lowest possible power consumption mode. A reset or external signal can wake the
device from this mode.
STANDBY:
HALT:
Functional Overview
26
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TMS320F28044PZS | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 32-Bit DSC w/ 128KB Flash RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設備每秒兆指令數(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 安裝風格:SMD/SMT |
| TMS320F28045PZA | 制造商:Texas Instruments 功能描述:- Trays |
| TMS320F28045PZS | 制造商:Texas Instruments 功能描述:- Trays |
| TMS320F28050PNQ | 制造商:Texas Instruments 功能描述:GIZMO |
| TMS320F28050PNS | 制造商:Texas Instruments 功能描述:GIZMO |
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