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537 Lite computer (1)

a high-performance, low-budget core microcontroller system with enhanced operational security

537 Lite computer (1)
Siemens refers to its top-end 8051 derivative, the 80C537, as the ‘8-bit elephant’. In this article, Elektor Electronics presents a low-budget controller board using this microcontroller, as a companion to the previously-published design for a versatile teaching and training system based on the 537. The ‘Lite’ version is intended to be an easily-replaced core system that lends itself to a variety of applications in small to middle-sized projects, and which also satisfies special demands relating to operational security.Even a superficial glance at the data sheet of the 80C537 microcontroller shows that it truly has a lot of capabilities: an 8(10)-bit A/D converter with twelve inputs, three 16-bit timer/counters with compare/capture features, an arithmetic coprocessor unit, an on-chip watchdog timer, seven bi-directional digital I/O ports, two full-duplex serial interfaces, 14 interrupt sources, lowpower modes and lots more.
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R1 = 1k?
P1 = 4k?7
C1,C12,C16 = 10µF 16V radial
C2-C8 = 100nF ceramic
C9,C10 = 22pF ceramic
C11,C13,C14,C15 = 1µF 16V radial
D1 = LED, 3 mm, red, high efficiency
D2 = 1N4148
IC1 = SAB 80C537-16-N
IC2 = EPROM 27C256 (order code 976510-1)
IC3 = GAL 16V8 (order code 996515-1)
IC4 = 74HCT573
IC5 = MAX232
IC7 = 62256 70ns
K1,K2 = 9-way sub-D socket, for PCB board edge mounting
K3 = 16-way boxheader with side latches, straight mounting
K4=14-way boxheader with side latches, straight mounting
K5,K7 = 35-way SIL pinheader
K6 = 4-way SIL pinheader
JP3,JP4,JP6 = 2-way pinheader + jumper
JP5,JP7,JP11,JP12,JP13,JP21,JP22 = 3-way pinheader + jumper
X1= 12 MHz quartz crystal
X2= 16 MHz quartz crystal
S1 = 3-way pinheader for connection to toggle switch
S2 = pushbutton, 1 make contact
BT1 = 3-V Lithium button cell, diameter 20 mm, with holder
PCB, order code 990054-1
Disk, contains 537 Monitor program, commented, order code 976008-1
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