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    • 4. 发明授权
    • Microprocessor controller with automatic clock-rate switching
    • 具有自动时钟速率切换的微处理器控制器
    • US5442774A
    • 1995-08-15
    • US122790
    • 1993-09-16
    • Ray L. PickupMark R. Thackray
    • Ray L. PickupMark R. Thackray
    • G06F1/08G01D15/16G06F11/00H03K5/19H03K21/02
    • G06F1/08
    • A printer controller employs a microprocessor together with an application-specific-integrated-circuit (ASIC) to manage the operation of the printer. Among its functions, the ASIC manages memory access for the microprocessor. Either fast- or slow-clock microprocessors may be installed in the controller, but the ASIC requires a slow clock. When a fast-clock microprocessor is installed, the ASIC must divide the clock frequency to provide its own (slow) clock. Likewise, the use of a fast-clock microprocessor requires the ASIC to insert memory-cycle WAIT times, whereas a slow-clock microprocessor needs no WAITs. In a preferred embodiment of the invention, provision is made, during initial power-on RESET, to inform the ASIC which clock speed is being used. This information is conveyed by the configuration of the WAIT interconnection between ASIC and microprocessor, thus eliminating the need for a dedicated ASIC pin for this purpose.
    • 打印机控制器使用微处理器与专用集成电路(ASIC)一起管理打印机的操作。 在其功能中,ASIC管理微处理器的存储器访问。 快速或慢速时钟微处理器可能安装在控制器中,但ASIC需要较慢的时钟。 当安装快速时钟微处理器时,ASIC必须将时钟频率分频以提供自己的(慢)时钟。 同样,使用快速时钟微处理器需要ASIC插入存储周期等待时间,而慢时钟微处理器不需要WAIT。 在本发明的一个优选实施例中,在初始上电复位期间提供通知ASIC正在使用哪个时钟速度。 该信息通过ASIC和微处理器之间的等待互连的配置来传达,从而消除了为此目的需要专用的ASIC引脚。