我看了关于DC80C400的一个介绍之后,对以下问题有疑问，请高手指点: 1.文中说"ROMless",但又说"IEEE 802.3 Ethernet Interface with TCP/IP in ROM",究竟是有ROM,还是没有?还是说有ROM,但已经固化了TCP/IP,不可访问,并且没有其它ROM. 2.在那里可以下载到有关DC80C400内嵌的操作系统的资料。 3.用户开发的程序在哪里运行？是不是要外接RAM？ 多谢！ 全文部分内容如下： 8051 based High-Speed Micro with 4 DPTRs, ROMless, WDT, 3 Serial Ports, CAN Controller, 4 Timers/Counters, IEEE 802.3 Ethernet Interface with TCP/IP in ROM, 1-Wire Net Controller, 64 I/O Lines + Address/Data Bus, 16 Interrupts/3 Priority Levels, 256 Bytes On-chip RAM, 9K Bytes On-chip SRAM, 16/32-bit Math Coprocessor, Optional 10-Bit Stack Pointer, Addresses up to 16M Bytes External Memory *** IMPORTANT *** The PK51 Professional Developer's Kit is required if you wish to create programs that access the 16M Byte external address space.
作者：nt_mouse 2005-4-18 14:35:00 |
