AN2343 Freescale Semiconductor / Motorola, AN2343 Datasheet - Page 2

• Manufacturer Part Number: AN2343
• Description: HC908EY16 LIN Monitor
• Manufacturer: Freescale Semiconductor / Motorola

AN2343/D
Hardware: HC908EY16 Sample Evaluation board
General Overview
Clock, Reset & IRQ
Options
Power and LIN
functionality
2
The HC908EY16 Sample board has been designed to allow the user an easy
development path with the EY family of parts.
Central to the board is the 44 pin HC908EY16. Each of the user pins (Ports A
through E) is brought out to Single In Line Headers (P3 & P5). This is to allow
the user to easily interface with much of the functionality of the EY16.
On board LEDs (on Ports A & D) are provided for general application use.
The EY16 is capable of running from a variety of clock sources: internally from
the Internal Clock Generator (ICG), externally from a crystal source (from
32KHz up to 8MHz), or from an external oscillator module. This board allows
the user to develop applications using any of the three options.
When using the on board crystal, it is necessary to make the link from pin 11 to
pin 13 on P4 and also from J2 pin 1 to pin 2. If using a clock source such as the
on board 9.8304MHz canned oscillator, these links should be removed. This
allows easy clock selection between the different sources.
Power on reset is provided on the board, as well as a reset switch (S2).
The IRQ pin is used on all Motorola HC08s to select between Monitor mode
and User mode. Link J1 allows the user to select the required mode. Its default
position is from pin 1 to 2. If using the Cyclone (see later text), this link should
be removed.
Power can be provided in two ways: either 12V through the Battery Input
Connector (B1) or 12V through the LIN Interface Connector (P2).
This LIN Connector is a three pin header, which is the requirement for
connection with a LIN Communication network (two power lines & single LIN
communication wire).
Whilst the HC908EY16 is designed as a general multi-purpose MCU, it does
have several features to simplify LIN interaction. These include an Enhanced
SCI module (with a special timer functionality for break detection & generation)
and the ICG (no external crystal required).
With these LIN features in mind, a LIN Physical Interface (MC33399) has been
included on the pcb. It is enabled by a port pin (PTB5 high) and can be
configured as either a Master or Slave node. If D1 & R4 are fitted, then the node
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HC908EY16 LIN Monitor
MOTOROLA