WPS Model 01a Control Engine
Selects and strobes jumper selections,
Designated port assignments

$Id: select-strobe.txt,v 1.1 2004/05/28 00:54:23 tomj Exp $
Tom Jennings


SELECT JUMPER AREA
.... indicates copper trace

SRC  ----O....O---- RA1
SRB  ----O....O---- RA2
SRA  ----O....O---- RA3
SCLK ----O....O---- RA4
RB5  ----O    O---- DAC
LED- ----O    O---- LED+
Vdd  ----O    O---- Vss (ground)


PIC PORT/PIN PREASSIGNMENTS
The following pins have preassigned functions, * indicates a
jumperable option, above.

	M01a	PIC
pin	signal	alt.	meaning
RA0	SD	AN0	serial data to SRs, DAC, hard to reuse
RA1	SRC*	AN1	cuttable trace default; analog comparator 1
RA2	SRB*	AN2	cuttable trace default; analog comparator 2
RA3	SRA*	AN3	cuttable trace default; analog comparator 3
RA4	SCLK*	T0CK1	cuttable trace default; timer0,
		CMP2	analog comparator
RA5	MCLR		not available
RA6	OSC2		xtal oscillator, reusable with effort
RA7	OSC1		xtal oscillator, reusable with effort

portB pins all available, but if onboard-PIC peripherals (UART,
etc) are used then the following Model 01a extras can be used:

RB0	INT		as input; use RB-U
RB1	RX		UART input; use RXD
RB2	TX		UART output; use TXD
RB3	CCP1		no particular Model 01a support
RB4	PGM		in-circuit programming, doesn't interfere
RB5	-		no alternate use
RB6	TIMER1		no particular Model 01a support
RB7	TIMER1, +	just RB-U7, but adjacent to RXD/TXD,
			for use as CTS input or output


ONBOARD FUNCTION...	CONSUMES PINS... (worst-case)
analog comparators	RA0, RA1, RA2, RA3
UART			RB1, RB2