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U S E R G U I D E
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FEATURES
The TWR-S12G128 is a demonstration board for the MC9S12G128 microcontroller; an
automotive, 16-bit microcontroller focused on low-cost, high-performance in a low pin-count
device. The MC9S12G128 provides16-bit wide accesses, without wait states, for all
peripherals and memories. The MC9S12G128 targets automotive applications requiring CAN
or LIN/J2602 communications. Examples include body controllers, occupant detection, etc…
The board is designed to interface to the Freescale Tower System, a modular development
platform which aids in rapid prototyping and tool-reuse. An integrated Open-Source BDM,
software tools, and examples provided with the development board make application
development and debug quick and easy. All MCU signals are available on one or both edge
connectors.
MC9S12G128, 100 LQFP
128K Bytes Flash
4096 Bytes EEPROM
8192 Bytes RAM
25MHz Bus Frequency
Internal Oscillator
SCI, SPI, MSCAN
Integrated Open Source BDM (OSBDM)
BDM_PORT header for external BDM cable support
1 ea. High-Speed CAN Physical Layer Transceiver
1 ea, Enhanced LIN Physical Layer Transceiver
RS-232 Serial Data Physical Layer Transceiver
On-board +5V regulator
Power input from OSBDM, Tower System, or input
vias at E1/E2
Power Input Selection Jumpers
Power input from USB-BDM
Power input from on-board regulator
Power input from Tower System edge connector
User Peripherals
4 User Push Button Switches
4 User LED Indicators
5K ohm POT w /LP Filter
User Option Jumpers to disconnect Peripherals
Connectors
BDM_PORT Connector for External BDM Cable
USB mini-AB Connector
2x5, 0.1” ctr, RS-232 Header
1x4, 4.2mm, Molex CAN Cable Connector
2x2, 4.2mm, Molex LIN Cable Connector
Specifications:
Board Size
3.55” x 3.20” overall
Power Input: +5V from USB connector or from Tower System
NOTE: LIN functionality re12V on LIN +V input or +12V at E1/E2 input.
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