公开(公告)号：EP0878765A2

公开(公告)日：1998-11-18

申请号：EP98108602.8

申请日：1998-05-12

申请人： Lexmark International, Inc.

发明人： Bush, Craig Palmer ,  Langer, David Brian

IPC分类号： G06F15/78

CPC分类号： G06F15/7814

摘要： A circuit for selecting a base memory to be accessed by a microcontroller in response to a command from the microcontroller. An input receives the command from the microcontroller. The command selectively instructs the circuit to reset the microcontroller and signal the microcontroller to access an internal memory as the base memory. Also, the command selectively instructs the circuit to reset the microcontroller and signal the microcontroller to access an external memory as the base memory. A reset output is used to send the reset signal to the microcontroller, and a memory select output is used to send a memory select signal to the microcontroller. A logic circuit processes the command received from the microcontroller, and selectively sends an internal base memory select signal on the memory select output in response to the command received from the microcontroller, while the reset signal is being processed by the microcontroller, and selectively sends an external base memory select signal on the memory select output in response to the command received from the microcontroller while the reset signal is being processed by the microcontroller.

摘要翻译： 用于响应于来自微控制器的命令，选择要由微控制器访问的基本存储器的电路。 输入接收来自微控制器的命令。 该命令有选择地指示电路复位微控制器并发出信号以使微控制器访问内部存储器作为基础存储器。 此外，该命令选择性地指示电路复位微控制器并且向微控制器发出信号以访问作为基础存储器的外部存储器。 复位输出用于将复位信号发送到微控制器，存储器选择输出用于向微控制器发送存储器选择信号。 逻辑电路处理从微控制器接收的命令，并且响应于从微控制器接收到的命令，选择性地在存储器选择输出上发送内部基本存储器选择信号，同时微控制器正在处理复位信号，并且选择性地发送 当微控制器正在处理复位信号时，响应于从微控制器接收到的命令，存储器选择输出上的外部基本存储器选择信号。