参数资料
型号: DSP56857BUE
厂商: Freescale Semiconductor
文件页数: 13/53页
文件大小: 0K
描述: IC DSP 16BIT 120MHZ 100-LQFP
标准包装: 90
系列: 568xx
核心处理器: 56800E
芯体尺寸: 16-位
速度: 120MHz
连通性: SCI,SPI,SSI
外围设备: DMA,POR,WDT
输入/输出数: 47
程序存储器容量: 80KB(40K x 16)
程序存储器类型: SRAM
RAM 容量: 24K x 16
电压 - 电源 (Vcc/Vdd): 1.62 V ~ 1.98 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 100-LQFP
包装: 托盘
56857 Technical Data, Rev. 6
20
Freescale Semiconductor
40
TRST
Input
Test Reset (TRST)—As an input, a low signal on this pin provides a reset
signal to the JTAG TAP controller. To ensure complete hardware reset,
TRST should be asserted whenever RESET is asserted. The only
exception occurs in a debugging environment, since the Enhanced
OnCE/JTAG module is under the control of the debugger. In this case it is
not necessary to assert TRST when asserting RESET. Outside of a
debugging environment RESET should be permanently asserted by
grounding the signal, thus disabling the Enhanced OnCE/JTAG module
on the device.
Note:
For normal operation, connect TRST directly to VSS. If the design is to
be used in a debugging environment, TRST may be tied to VSS through a 1K
resistor.
39
DE
Input/Output
Debug Event (DE)—This is an open-drain, bidirectional, active low
signal. As an input, it is a means of entering debug mode of operation
from an external command controller. As an output, it is a means of
acknowledging that the chip has entered debug mode.
This pin is connected internally to a weak pull-up resistor.
Table 3-1 56857 Signal and Package Information for the 100-pin LQFP (Continued)
Pin No.
Signal Name
Type
Description
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