68HC16 MAXIM | Alldatasheet
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Technical content
The 68HC16 module is an assembled and tested print- ed-circuit board intended for use with Maxim’s high- speed serial-interface evaluation kits (EV kits). The module uses an inexpensive 8-bit implementation of Motorola’s MC68HC16Z1 microcontroller (µC) to collect data samples at high speed using the QSPI™ interface. It requires an IBM-compatible personal computer and an external DC power supply, typically 12V DC or as specified in EV kit manual. Maxim’s 68HC16 module is provided to allow customers to evaluate selected Maxim products. It is not intended to be used as a microprocessor development platform, and such use is not supported by Maxim. QSPI is a trademark of Motorola Corp. 68HC16 Module Power Input Connector J2 The 68HC16 module draws its power from a user-sup- plied power source connected to terminal block J2. Be sure to note the positive and negative markings on the board. A three-terminal 5V regulator allows input voltages between 8V and an absolute maximum of 20V. The 68HC16 module typically requires 200mA of input current. 68HC16 Microcontroller U1 is Motorola’s 68HC16Z1 µC. Contact Motorola for µC information, development, and support. Maxim EV kits use the high-speed queued serial peripheral interface (QSPI) and the internal chip-select generation. 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. Right-angle printed circuit board mount, DB9 female socket1J3 2-circuit terminal block1J2 40-pin right-angle male connector1J1 1N4001 diode1D1 0.1µF capacitors5C10–C14 Reference designator, not used0C9 0.01µF capacitor1C8 22pF capacitors2C6, C7 22µF, 25V radial-lead electrolytic capacitors2C4, C5 1µF ceramic capacitors3C1, C2, C3 DESCRIPTIONQTYDESIGNATION 10MΩ, 5% resistor1R1 Light-emitting diode1LED1 Open0L2 Open0L1 Open0JU5 Open0JU4 Open0JU3 Reference designator, not used0JU2 Open0JU1 Open0J4 Rubber feet4None 32.768kHz watch crystal1Y1 Maxim MAX707CPA1U7 74HCT245 bidirectional buffer1U6 62256 (32K x 8) static RAM1U5 7805 regulator, TO-220 size1U4 27C256 EPROM containing monitor program1U3 Maxim MAX233CPP1U2 68HC16 µC MC68HC16Z1CFC16 (132-pin plastic quad flat pack) 1U1 330kΩ, 5% resistor1R2 DESCRIPTIONQTYDESIGNATION Heatsink for U4, thermalloy # 60781None 3" x 5" printed circuit board1None 20-pin socket for U61None 28-pin socket for U31None 10kΩ, 5% resistors2R3, R4 Slide switch1SW1 Momentary pushbutton switch1SW2 470Ω, 5% resistor1R5 10kΩ SIP resistor1R6 68HC16 Module 68HC16 Module 19-1322; Rev 0; 12/97 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
trol register, selecting a bus speed of 16.78MHz. U5, the user RAM area, is a 32kbyte CMOS static RAM. access an 8-bit port on the 40-pin interface connector. adapter. Table 1 shows the pinout of J3. ates the output voltages necessary to drive RS-232 lines. a Maxim EV kit. Table 2 lists the function of each pin. 68HC16 module will have unpredictable results. decoded, the boot ROM and user RAM have shadows. Table 1. Serial Communications Port J3 Table 2. 40-Pin Data-Connector Signals
kit manual for specific start-up procedures. All software is supplied on a disk with the EV kit. ROM, and RAM passed the self test. if the 32.768kHz reference oscillator is running. Table 3. 68HC16 Module Memory Map
Table 4. 68HC16 Chip-Select Outputs Truth Table Figure 1. 68HC16 Module Schematic
Figure 1. 68HC16 Module Schematic (continued)
21 PFO
12 JU5
3 VCCA14
Figure 2. 68HC16 Module Component Placement Guide