I was looking at other Motorola 6800 family MPUs, curious to see if there was an 'off the shelf' equivalent of the SC44125 (customized 6800 with full-time A / D buses and the 6801 instruction set).
The 68HC11 has all the specific 6801 opcodes I would need (and which are not otherwise implemented on the 68HC05 or 6809).
I'm intrigued, but one thing: the HC11 clock speed is listed as 3MHz, while the SC44125 runs on a 1MHz clock.
Am I correct in assuming if I run the HC11 at its native 3MHz with the 6801 code, the code would end up running 3 times as fast?
It seems to be possible to tweak a PC to 'underclock' it to run at a lower speed, but has it been done with an 8-bit MPU?
The 68HC11 has all the specific 6801 opcodes I would need (and which are not otherwise implemented on the 68HC05 or 6809).
I'm intrigued, but one thing: the HC11 clock speed is listed as 3MHz, while the SC44125 runs on a 1MHz clock.
Am I correct in assuming if I run the HC11 at its native 3MHz with the 6801 code, the code would end up running 3 times as fast?
It seems to be possible to tweak a PC to 'underclock' it to run at a lower speed, but has it been done with an 8-bit MPU?