User's Guide

1-6 Sensor Applications Reference Design (SARD) User’s Guide MOTOROLA
Introduction and Configuration
1.3.3 Power Capability
The SARD can be powered from a 5.5 to 9 V supply connected to J106 or a 9 V battery connected to the
board-mounted battery terminals. See Figure 1-4 for J106 and battery terminal placement. If the
accelerometers are not used, 2.0-3.4V can be supplied on J103. In this configuration, the accelerometer
outputs are indeterminate.
1.3.4 LEDs and Switches
D101 through D104 and Switches S101 through S104 are connected to I/O as shown on the SARD
schematic and in Figure 1-4. These are useful as indicators and control in applications. Connections to
MCU ports are listed in Table 1-1. The on-off switch, S105 is labeled on the board.
1.3.5 Board Reset Function
A hardware reset can be performed on the SARD in two ways:
The Reset push button.
The MCU resets the SARD as part of its startup sequence when power is applied and the On/Off
switch is turned on.
In both cases, the reset sequence resets the MCU which, in turn, resets the MC13192.
1.3.6 MCU General Purpose Input/Output (GPIO)
Figure 1-4 shows the MCU GPIO that can be interfaced with external hardware such as sensors. When
using the on-board accelerometers, shunts must be installed at PTB0, PTB1, and PTB7, which corresponds
to pins 1 and 2, 3 and 4, 11 and 12, of J105, to connect the accelerometer ICs to the MCU. For user defined
applications, these shunts can be removed and other hardware attached to the GPIO pins.
1.3.7 BDM Port
Header J101 is a BDM port for use with a P&E BDM-Multilink cable which is available from Metrowerks.
The BDM cable is used with CodeWarrior™ Development Studio for the HCS08 to program the MCU
flash memory as well as performing in-circuit debugging. See Figure 1-4 for the position of pin 1. The red
lead of the BDM cable must align to pin 1 of J101.
Table 1-1. LED and Switch Port Connection
LED/Switch MCU Port I/O
LED 1, D101 PTD0 Output
LED 2, D102 PTD1 Output
LED 3, D103 PTD3 Output
LED 4, D104 PTD4 Output
RESET, S106 RESET -----
S101 PTA2 Input
S102 PTA3 Input
S103 PTA4 Input
S104 PTA5 Input