Mcu Mode Select - Motorola M68HC11EVBU User Manual

HARDWARE PREPARATION AND INSTALLATION
The following pages describe the EVBU jumper headers. Jumper
headers consist of feed-thru holes, feed-thru holes with cut-trace
shorts on the printed circuit board (PCB) solder side, and jumper
headers with fabricated jumpers installed as shown in Figure 2-1.
The EVBU (factory configuration) is shown in Figure 2-1. The
EVBU is configured for MC68HC11E9 MCU single-chip mode of
operation.
Depending on the application, you may need to cut the cut-trace
shorts on the PCB solder side. Use extreme care when cutting the
cut-trace shorts to avoid cutting adjacent PCB wiring traces.
Failure to adhere to this CAUTION could result in many hours of
troubleshooting and repair time.
Jumper header locations J1 through J15 provide the following functional capabilities:
• Input Power Select (J1)
• Program Execution Select (J2)
• MCU Mode Select (J3 and J4)
• MCU Clock Reconfiguration (J5 and J6)
• Trace Enable (J7)
• SCI Reconfiguration (J8 and J9)
• SPI Reconfiguration (J10 thru J12)
• Real-Time Clock INT* (J14)
• TxD Reconfiguration (J15)
2-2
NOTES
CAUTION
M68HC11EVBU/D