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: 82/122页
文件大小: 1465K
代理商: TMS320F241PGS
TMS320F243, TMS320F241
DSP CONTROLLERS
SPRS064D DECEMBER 1997 REVISED FEBRUARY 2006
62
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
CAN configuration mode (continued)
The CAN module must be initialized before activation. This is only possible if the module is in configuration
mode. The configuration mode is set by programming the CCR bit of the MCR register with “1”. Only if the status
bit CCE (GSR.4) confirms the request by getting “1”, the initialization can be performed. Afterwards, the bit
configuration registers can be written. The module is activated again by programming the control bit CCR with
zero. After a hardware reset, the configuration mode is active.
watchdog (WD) timer module
The F243/F241 devices include a watchdog (WD) timer module. The WD function of this module monitors
software and hardware operation by generating a system reset if it is not periodically serviced by software by
having the correct key written. The WD timer operates independently of the CPU and is always enabled. It does
not need any CPU initialization to function. When a system reset occurs, the WD timer defaults to the fastest
WD timer rate available (6.55 ms for a 39 062.5-Hz WDCLK signal). As soon as reset is released internally, the
CPU starts executing code, and the WD timer begins incrementing. This means that, to avoid a premature reset,
WD setup should occur early in the power-up sequence. See Figure 15 for a block diagram of the WD module.
The WD module features include the following:
D WD Timer
Seven different WD overflow rates ranging from 6.55 ms to 419.43 ms
A WD-reset key (WDKEY) register that clears the WD counter when a correct value is written, and
generates a system reset if an incorrect value is written to the register
WD check bits that initiate a system reset if an incorrect value is written to the WD control register
(WDCR)
D Automatic activation of the WD timer, once system reset is released
Three WD control registers located in control register frame beginning at address 7020h.
NOTE: All registers in this module are 8-bit registers. When a register is accessed, the register data is in the lower byte, the upper byte is read
as zeros. Writing to the upper byte has no effect.
Figure 15 shows the WD block diagram. Table 18 shows the different WD overflow (timeout) selections.
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