-
1.发明授权
公开(公告)号：US5872994A
公开(公告)日：1999-02-16
申请号：US745828
申请日：1996-11-12
IPC分类号： G06F12/16 , G06F11/14 , G06F11/22 , G06F15/78 , G11C17/00 , G11C29/00 , G11C29/14 , G06F9/44 , G06F12/12
CPC分类号： G06F11/1433
摘要： In a microcomputer comprising internal buses, a serial communication interface, a flash memory, a RAM, a ROM for storing a writing program, an input/output port, a CPU, and a mode control unit for setting various operation modes and test modes in the microcomputer, a switching circuit is connected between the ROM and the internal buses and between the input/output port and the internal buses. The mode control unit operates the switching circuit in an emulation test mode so that the ROM is deactivated and the input/output port is activated. Then, the CPU reads a program from the serial communication interface and writes the program into the flash memory in accordance with a writing program from the input/output port.
摘要翻译： 在包括内部总线，串行通信接口，闪存，RAM，用于存储写入程序的ROM，输入/输出端口，CPU和模式控制单元的微型计算机中，用于设置各种操作模式和测试模式 微型计算机，开关电路连接在ROM和内部总线之间以及输入/输出端口和内部总线之间。 模式控制单元以仿真测试模式操作开关电路，使得ROM被去激活并且输入/输出端口被激活。 然后，CPU从串行通信接口读取程序，并根据来自输入/输出端口的写入程序将程序写入闪速存储器。
-
公开(公告)号：US4958140A
公开(公告)日：1990-09-18
申请号：US324814
申请日：1989-03-17
CPC分类号： G06F7/02
摘要： A comparator unit for discriminating input data bit groups has a first logical circuit to compare an input data bit group with a reference data bit group and produce a consistent data bit group or an inconsistent data bit group. A second logical circuit responds to a masking data bit group and converts the inconsistent data bit group into the consistent data bit group when the masking data bit group specifies a part of the input data bits where the inconsistency takes place. Therefore, a plurality of predetermined data bit groups are detectable on the basis of the single reference data bit group.
-
搜索结果
2 条记录 (耗时 0.011 秒)