Microprocessor with reset execution from an arbitrary address

Details Microprocessor with reset execution from an arbitrary address Microprocessor with reset execution from an arbitrary address

1992-10-22

1994-11-01

Bowler, Alyssa H.

Boots, shoes, and leggings

3642217, 364229, 3642295, 3642305, 3642425, 36424691, 36424692, 3642551, 3642653, 36426791, 3642678, 3642755, 3642803, 3642852, 364DIG1, 364DIG2, G06F 922, G06F 926, G06F 9312, G06F 9445

Patent

active

053613716

ABSTRACT:
A microprocessor which, following a reset signal, permits execution beginning from an arbitrary address. The microprocessor is constituted in a manner such that arbitrary data is set in advance in a data register as an address. The address in the data register is given to a program counter by a register indirect jump instruction which does not originate in the instruction ROM. The microprocessor has a resetting function in addition to the normal resetting function. The normal resetting function includes re-executing a program from a predetermined address, such as a zero address. The normal resetting function occurs in the case where the logical level of a control signal input terminal is a predetermined level at a point of time when the reset signal to the reset terminal is cleared. When the control signal is at a different level, the arbitrary data set in the data register is transferred to the program counter by the register indirect jump instruction and is set in the program counter. The program is then re-executed with that data set as an instruction start address.

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