D
David Chapman
- Jan 1, 1970
- 0
Greetings,
I wish to use two PIC16F628A processors in a particular circuit I'm
putting together. They will each have a different clock oscillator
frequency, and only one PIC will ever need to operate at any particular
time.
Some of the I/O lines in the circuit are common to both processors so
I'd like to ask the PIC experts in this NG if, when held in the Reset
condition, it is definite that all of the 16F628A processor's I/O lines
will be tri-stated.
I'd like to keep the Vcc supply on both devices and simply switch
between them by holding the UNwanted processor in the Reset state. Is
this approach acceptable?
Before anyone rushes to point out that this is not an elegant solution
and one single processor is the correct way to go, I have to agree but
say in my defence that since I already have code written for the 16F628A
PICs and only need a couple of these dual-processor units, any rewrite
of the code for a different device would not be cost effective.
TIA - Dave.
I wish to use two PIC16F628A processors in a particular circuit I'm
putting together. They will each have a different clock oscillator
frequency, and only one PIC will ever need to operate at any particular
time.
Some of the I/O lines in the circuit are common to both processors so
I'd like to ask the PIC experts in this NG if, when held in the Reset
condition, it is definite that all of the 16F628A processor's I/O lines
will be tri-stated.
I'd like to keep the Vcc supply on both devices and simply switch
between them by holding the UNwanted processor in the Reset state. Is
this approach acceptable?
Before anyone rushes to point out that this is not an elegant solution
and one single processor is the correct way to go, I have to agree but
say in my defence that since I already have code written for the 16F628A
PICs and only need a couple of these dual-processor units, any rewrite
of the code for a different device would not be cost effective.
TIA - Dave.