Motorola M68CPU32BUG Manuel d'utilisateur télécharger pdf (Page 18)

HARDWARE PREPARATION AND INSTALLATION

M68332BCC/D 2-8 MOTOROLA

REV 1

2.3.4 TxD Select Header (J4)

Jumper header J4 allows the user to disconnect the transmit TxD serial data pin of the MC68332

MCU device (U5) from the RS-232C receiver/driver (U6) and use a target system

receiver/driver. The BCC is shipped from the factory with the receiver/driver connected to MCU

TxD (pin 52) via a cut-trace short on the bottom of the BCC PCB between J4, pins 1 and 2

(shown below). A fabricated jumper is also installed on pins 1 and 2. To disconnect the serial pin

of the MCU, cut this trace and remove the jumper.

TxD

DI1 TX1

TxD

MC68332 MCU

MC145407

64-Pin Expansion Connector

XMT 232

Fabricated Jumper

NOTE

If the cut-trace short on jumper header J4 is cut, the fabricated jumper must be

reinstalled on J4 to return the BCC to its default setting.

Refer to the BCC schematic diagram for more detail on TxD signal wiring.

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Motorola M68CPU32BUG Manuel d'utilisateur Page 18