16 bit address access using 8 bit registers

Details 16 bit address access using 8 bit registers 16 bit address access using 8 bit registers

1995-02-28

1998-04-21

Nguyen, Chanh

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345 50, G09G 522

Patent

active

057422826

ABSTRACT:
The 16 bit program counter of an 8 bit microprocessor within a camera is used to provide a 16 character display on the camera, such that messages with a 16 bit address are accessed. When the message for display is invoked, the address of the message is placed in the program counter, and a software interrupt is caused. Due to the software interrupt, the upper and lower bytes of the address in the program counter are pushed onto the stack, popped off the stack and stored in adjacent memory locations. The address may then be read from the adjacent memory locations, the message displayed and a return from interrupt effected.

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"HD4478OU Dot-Matrix Liquid Crystal Display Controller/Driver", Dec. 1992, Hitachi, Ltd. pp. 1-59.

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