参数资料
型号: TMS320F241PGS
厂商: TEXAS INSTRUMENTS INC
元件分类: 数字信号处理
英文描述: 0-BIT, 5 MHz, OTHER DSP, PQFP64
封装: PLASTIC, QFP-64
文件页数: 54/122页
文件大小: 1465K
代理商: TMS320F241PGS
TMS320F243, TMS320F241
DSP CONTROLLERS
SPRS064D DECEMBER 1997 REVISED FEBRUARY 2006
37
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
clock generation
The F243/F241 devices have an on-chip, (x4) PLL-based clock module. This module provides all the necessary
clocking signals for the device, as well as control for low-power mode entry. The only external component
necessary for this module is a fundamental crystal. The “times 4” (x4) option for the F243/F241 PLL is fixed and
cannot be changed.
The PLL-based clock module provides two modes of operation:
D Crystal-operation
This mode allows the use of a 5-MHz external reference crystal to provide the time base to the device.
D External clock source operation
This mode allows the internal oscillator to be bypassed. The device clocks are generated from an external
clock source input on the XTAL1/CLKIN pin. In this case, an external oscillator clock is connected to the
XTAL1/CLKIN pin.
The clock module includes two external pins:
1.
XTAL1/CLKIN
clock source/crystal input
2.
XTAL2
output to crystal
XTAL2
XTAL1/CLKIN
x4
PLL
XTAL
OSC
CPUCLK
Figure 7. PLL Clock Module Block Diagram
low-power modes
The 24x has an IDLE instruction. When executed, the IDLE instruction stops the clocks to all circuits in the CPU,
but the clock output from the CPU continues to run. With this instruction, the CPU clocks can be shut down to
save power while the peripherals (clocked with CLKOUT) continue to run. The CPU exits the IDLE state if it is
reset, or, if it receives an interrupt request.
clock domains
All 24x-based devices have two clock domains:
1.
CPU clock domain consists of the clock for most of the CPU logic
2.
System clock domain consists of the peripheral clock (which is derived from CLKOUT of the CPU) and
the clock for the interrupt logic in the CPU.
When the CPU goes into IDLE mode, the CPU clock domain is stopped while the system clock domain continues
to run. This mode is also known as IDLE1 mode. The 24x CPU also contains support for a second IDLE mode,
IDLE2. By asserting IDLE2 to the 24x CPU, both the CPU clock domain and the system clock domain are
stopped, allowing further power savings. A third low-power mode, HALT mode, the deepest, is possible if the
oscillator and WDCLK are also shut down when in IDLE2 mode.
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