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Universal XA Development board (2)

construction and use

Universal XA Development board (2)
Last month we examined the theoretical aspects of the universal development board for the Philips XA series of microcontrollers. In this second and concluding part, we describe the construction of the board and programming considerations.Although the circuit is rather large and complex, the Elektor Electronics laboratories succeeded in fitting everything onto a single Eurocard (100 × 160 mm). The circuit board layout also gives proper consideration to the placement of he PC/104 connector and the associated fitting holes.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors:
R1,R2,R3,R6 = 4k?7
R4 = 1k?5
R5 = 1k?
Capacitors:
C1-C5,C10-C21,C24 = 47nF
C6...C9 =1µF 25V radial
C22,C27 = 100nF
C23 = 2nF2
C25 = 220nF
C26 = 10µF 35V radial
Semiconductors:
D1 = 1N4001
D2 = LED, low-current
IC1 = PXAC37KBA (Philips Semiconductors, see text)
IC2,IC3 = 74HCT573
IC4,IC5 = 74HCT245
IC6 = 74HCT244
IC7 = MAX232 (Maxim)
IC8,IC9 = 27C256-90, programmed, IC8: order code 010103-21, IC9: order code 010103-22)
IC10,IC11 = 62256–55 (RAM)
IC12 = GAL16V8 (programmed, order code 010103-31)
IC13 = 74HCT14
IC14 = ADM691A
IC15 = PCA82C250T
IC16 = L7805CP
IC17 = 16MHz oscillator module
IC18 = 1.8432MHz oscillator module
Miscellaneous:
BAT1 = 3 V Lithium battery
JP1,JP2,JP3 = jumper
K1 = 9-way sub-D socket (female), PCB mount, angled pins
K6 = PC/104 connector, two rows of 32 contacts (see text)
S1 = 8-way DIP switch Heatsink for C16
PCB, order code 010103-1
Disk, contains source, hex and Jedec files, XADEV; order code 010103-11 or Free Download
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