第2章_F2812结构与最小系统(15)

2015/11/10

DSP控制器原理及应用

扩展存储器的最小系统需要的控制总线CB XZCS2(外存储器扩展接口块片选信号2) XINTF Zone 2 Chip Select. XZCS2 is (low) when an access to the XINTF Zone 2 is performed.

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DSP控制器原理及应用

扩展存储器的最小系统需要的控制总线CBXMP/MC引脚(工作模式选择,输入) Microprocessor(XMP)/Microcomputer(MC) Mode Select. Switches between microprocessor and microcomputer mode. When high, Zone 7 is enabled on the external interface. When low, Zone 7 is disabled from the external interface, and on-chip boot ROM may be accessed instead. This signal is latched into the XINTCNF2 register on a reset and the user can modify this bit in software. The state of the XMP/MC pin is ignored after reset.

思考题2-10:当程序存储器映射到外部程序空间时,该引脚设应何处理?

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