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: 45/122页
文件大小: 1465K
代理商: TMS320F241PGS
TMS320F243, TMS320F241
DSP CONTROLLERS
SPRS064D DECEMBER 1997 REVISED FEBRUARY 2006
29
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
reset
The reset operation ensures an orderly startup sequence for the device. There are two possible causes of a
reset, as shown in Figure 5.
Signal
Reset
System Reset
Watchdog Timer Reset
External Reset (RS) Pin Active
Figure 5. Reset Signals
The two possible reset signals are generated as follows:
D Watchdog timer reset. A watchdog-timer-generated reset occurs if the watchdog timer overflows or an
improper value is written to either the watchdog key register or the watchdog control register. (Note that
when the device is powered on, the watchdog timer is automatically active.) The watchdog timer reset is
reflected on the external RS pin also.
D Reset pin active. To generate an external reset pulse on the RS pin, a low-level pulse duration of at least
one CPUCLK cycle is necessary to ensure that the device recognizes the reset signal.
Once watchdog reset is activated, the external RS pin is driven (active) low for a minimum of eight CPUCLK
cycles. This allows the TMS320x24x device to reset external system components.
The occurrence of a reset condition causes the TMS320x24x to terminate program execution and affects
various registers and status bits. During a reset, RAM contents remain unchanged, and all control bits that are
affected by a reset are initialized to their reset state.
hardware-generated interrupts
The 24x CPU supports one nonmaskable interrupt (NMI) and six maskable prioritized interrupt requests. The
24x devices have many peripherals, and each peripheral is capable of generating one or more interrupts in
response to many events. The 24x CPU does not have sufficient interrupt requests to handle all these peripheral
interrupt requests; therefore, a centralized interrupt controller is provided to arbitrate the interrupt requests from
all the different sources. Throughout this section, refer to Figure 6 .
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