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MPLAB-ICD Header Board Modification ensure proper operation MPLAB


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Engineering Technical Note
MPLAB-ICD Header Board Modification
ensure proper operation MPLAB-ICD with Revision Header board (revision number text copper bottom board) following items should followed. First, circuitry connected pins application board should removed. MPLAB-ICD uses these pins exclusively communicate control operation ICD. Second, Voltage Programming (LVP) should disabled configuration word PIC16F87X device. Since used ICD, enabling this fuse cause device enter programming mode unexpectedly. last item requires trace Header board. attached file shows location trace cut. This trace incorrectly routed instead PIC16F877 Header board. jumper wire needed connect modular connector because should disabled. Symptom: MPLAB-ICD problems communicating with PIC16F877 device does seem work properly. Problem: MPLAB-ICD Header board signals incorrectly routed 40-pin socket connection Revision boards. application hardware connected these pins, MPLAB-ICD able communicate with PIC16F877 unexpected lock-ups occur. Solution: Disconnect circuitry application board that connects pins RB7. These pins must left unconnected application.
Symptom: MPLAB-ICD ceases operate when Voltage ICSP Programming configuration (LVP) enable this mode. Lock-ups loss communications with PIC16F877 occur. Problem: MPLAB-ICD Header board signal incorrectly routed Revision boards. Solution: MPLAB-ICD does support Voltage Programming mode. should disabled configuration word.
Symptom: does seem drive correctly Vss. Problem: MPLAB-ICD Header board signal incorrectly routed Revision boards. Solution: MPLAB-ICD Header requires that trace component side. Please attached drawing location trace position cut.
Rodger Richey, Project Manager, AMSG Applications
etn20.doc
Microchip Technology, Inc.
9/24/99 Rev.A
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