Microprocessor architecture having internal access means

Details Microprocessor architecture having internal access means Microprocessor architecture having internal access means

G - Physics

06

F

354/225.1

G06F 11/28 (2006.01) G06F 11/267 (2006.01) G06F 11/36 (2006.01)

Patent

CA 1171968

- 43 - MICROPROCESSOR ARCHITECTURE HAVING INTERNAL ACCESS MEANS Abstract of the Disclosure A processor architecture is disclosed which permits the registers and control latches of the processor to be easily accessed without using instructions to achieve such access. The architecture provides for an internal access (IA) function which is enabled by applying an IA Request signal to an IA terminal of the processor. During the IA function, normal program execution in the processor is suspended and the registers and control latches may be accessed as if they were storage locations in a random- access memory. After the IA function is enabled, the address of a register or control latch selected for access is applied to the Address/Data port of the processor, and an IA Control Code specifying the storbing of the Address/Data port is applied to the Status terminals of the processor. After strobing of the address, a second IA Control Code specifying either reading or writing of the selected register or control latch is applied to the Status terminals. If the second Control Code speciifes reading, the contents of the selected register or control latch is provided at the Address/Data port. If the second Control Code specifies writing, data received at the Address/Data port is stored in the selected register.

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