System and method for incrementing a program counter

Details System and method for incrementing a program counter System and method for incrementing a program counter

1992-12-24

1995-04-25

Bowler, Alyssa H.

Boots, shoes, and leggings

364DIG2, 364770, 3649332, 3649371, 3649372, G06F 700

Patent

active

054107210

ABSTRACT:
A data processor (10) increments a sixteen bit program counter value using an arithmetic logic unit, ALU, (224) and an eight bit incrementer(250). The ALU increments a low byte of the program counter value. A carry generated by incrementing the low byte is propagated to the incrementer. The incrementer then increments the high byte of the program counter value. Subsequently, the high and low bytes of the program counter value are respectively stored in a high and low program counter register (200, 206). Therefore, eight bits of an incrementer which would have typically been required to implement an incrementer for the low byte of the program counter value have been eliminated without a reduction in functionality of the data processor.

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"Microprocessor, Microcontroller and Peripheral Data", vol. I, published by Motorola, Inc. in 1988, pp. 3-61 through 3-91.

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