This file provides a user manual for the M68DEMO908GB60 development board, including precautions, terms, features, usage steps, reference documents, startup, demo programs, debug monitor operation, board operation, power supply, Y1 crystal, SCI1 and SCI2 ports, LED1-5 indicators, VRH_SEL and 1.8V reference, SW1-SW4 push buttons, JP1-PWM/DAC, etc.
The M68DEMO908GB60 is an evaluation and demonstration board for the Freescale MC9S08GB60 microcontroller. It includes a regulated 3.3 V supply, AA‑battery holder, DB‑9 serial cable, LEDs, push‑switches and jumpers that let users quickly develop and test applications using the on‑board debug monitor and sample programs.
The manual covers safety cautions, board features, power‑supply selection, jumper configurations, and how to select and run the four demo programs (Stop‑3 low‑power, software‑paced loop, ATD/timer, and debug monitor). It also describes the serial debug monitor operation, I/O port connectors, and the BDM debug port for advanced development.
| Board Size | 4" x 4.5" |
|---|---|
| Power Input | +6 to +12 VDC (9 VDC typical) |
| Current Consumption | 30 mA @ 9 VDC |
| Flash Memory | 60 KB |
| RAM | 4 KB |
| I/O Lines | 56 I/O lines (64 pins) |
| ADC Channels | 8‑channel 10‑bit A/D |
| Serial Ports | 2 × SCI ports |
| Regulated Voltage | +3.3 V |
Demo programs are selected by holding down one of the three push‑switches (SW2, SW3, or SW4) while applying power; if no switch is held, the low‑power Stop‑3 demo runs by default.
The board accepts an external supply of +6 V to +12 VDC (9 VDC typical) via the power jack, or it can run from two AA batteries providing about 3 V.
Connect a straight‑through DB‑9 serial cable between the PC’s COM port and the board’s SCI1 connector; the monitor communicates at 115.2 kbps.