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Intel 8748是一种单片微计算机,使用较为方便。但是,对芯片中的EPROM进行编程写入却比一般常用的EPROM麻烦得多。厂家推荐使用该公司的开发系统以及专用模块。我们在没有上述设备的情况下,根据用户手册提供的参数,用一台Z-80单板机,加上一些辅助电路,对8748和8755A两种芯片的EPROM进行了编程写入。 1.电路整个电路的连接见图1。8748在编程/验证期间,需用5个控制端:T_0,(?),V_(DD)PROG,EA_0T_0和RESET只要求TTL逻辑电平,由PIOA口直接控制。EA只有在插片时
Intel 8748 is a single-chip microcomputer, the use of more convenient. However, programming the EPROM on a chip is much more annoying than the usual EPROM. Manufacturers recommend using the company’s development system and dedicated modules. We did not have the above equipment, according to the parameters provided in the user manual, with a Z-80 single-board machine, plus some auxiliary circuit, 8748 and 8755A two EPROM chip programmed write. 1. Circuit The entire circuit is connected as shown in Figure 1.8748 During programming / verification, five control terminals are required: T_0, (?), V_ (DD) PROG, EA_0T_0 and RESET only require TTL logic level, Direct control. EA only when the insert