80C32MODULE
______________________80C32 Module
80C32 Module General Description
The Maxim 80C32 microcontroller (碌C) module is
intended for use with this and other Maxim evaluation
kits (EV kits). It contains the 80C32 碌C, RS-232 inter-
face, 8kbytes of EPROM, 32kbytes of static RAM, and
address decoding logic. A 40-pin connector mates with
a connector found on Maxim EV kits designed to inter-
face with the 80C32 module.
The module is connected to an IBM-compatible per-
sonal computer over a serial communications port.
Software provided with each EV kit runs on the comput-
er and controls the unit consisting of the 80C32 module
and EV kit. The program uses a routine stored in the
27C64 EPROM to download special 80C32 code for
each kit. The downloaded code controls the EV kit and,
together with the program running on the personal
computer, displays the output data.
The board operates from a single 8V to 22V supply.
Both the pre-regulated and regulated +5V levels are
available to the EV kit through the 40-pin connector.
____80C32 Module Component List
DESIGNATION
C1, C2
C4, C5, C6, C7,
C8, C9, C10,
C11, C12
C3, C13, C14
D1
J1
J2
R1
RS1
SW1
SW2
IC1
IC2
IC3
IC4
IC5
IC6
IC7
IC8
IC9
IC10
Y1
None
None
None
None
QTY
2
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DESCRIPTION
15pF ceramic capacitors
0.1碌F, 50V ceramic capacitors
22碌F, 16V radial electrolytic
capacitors
1N4001 diode
40-pin right-angle male connector
DB9 right-angle socket
620鈩?resistor
10k鈩?10-pin, 9-resistor SIP
Power switch
Reset switch
80C32
MAX233CPP
27C64
74HCT573
74HCT139
74HCT08
74HCT245
62256
78M05
MAX707CPA
11.059MHz crystal
2-pin power connector
28-pin 600-mil socket for IC3
(the EPROM)
Rubber feet
3.00" x 5.50" PC board
80C32 Module Power Supply
The Maxim 80C32 module requires an input of 8V to 22V
for normal operation. An on-board 78M05 power regula-
tor supplies the 5V required for the logic on the module,
and any 5V requirements for the EV kit attached to the
40-pin connector. The pre-regulated voltage is also avail-
able on the data connector. The source must be capable
of supplying 100mA for the module and meeting the load
requirements of the EV kit.
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Microprocessor Supervisor
A MAX707 on the module monitors the 5V logic supply,
generates the power-on reset, and produces a reset
pulse whenever the reset button is pressed. A watch-
dog function was not included because they frequently
interfere while debugging programs, and debugging is
a prime function of this board.
80C32 Microcontroller
The 80C32 is a member of the popular Intel 8051 family
of 碌Cs. It is a low-power CMOS version that requires
external ROM for program storage, 256 bytes of inter-
nal RAM, and four 8-bit I/O ports. Three of the ports are
required by the system for serial communications and
memory control. The fourth port (P1) is available
through the data connector.
The 80C32 communicates with the PC over a serial RS-
232 link. A MAX233 acts as a level shifter between the
鹵15V RS-232 signals and the TTL levels of the 80C32.
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