PIC18F4680-I/PT integrated circuit components 8 bit microcontroller - MCU

PIC18F2585/2680/4585/4680

Rev. A1 Silicon Errata

The PIC18F2585/2680/4585/4680 Rev. A1 parts you have received conform functionally to the Device Data Sheet (DS39625C), except for the anomalies described below. Any Data Sheet Clarification issues related to the PIC18F2585/2680/4585/4680 will be reported in a separate Data Sheet errata. Please check the Microchip web site for any existing issues.

All of the issues listed here will be addressed in future revisions of the PIC18F2585/2680/4585/4680 silicon.

1. Module: ECCP

When monitoring a shutdown condition using a bit test on the ECCPASE bit (ECCP1AS<7>) or performing a bit operation on the ECCPASE bit, the device may produce unexpected results.

Work around

Before performing a bit test or bit operation on the ECCPASE bit, copy the ECCP1AS register to the working register and perform the test or operation there.

By avoiding these operations on the ECCPASE bit in the ECCP1AS register, the module will operate normally

2. Module: ECCP

When a shutdown condition occurs, the output port is made inactive for the duration of the event. After the event that caused the shutdown ends, the ECCP module immediately enables the PWM output and does not wait until the beginning of the next PWM cycle.

Work around

Disable the auto-restart feature in software, poll the Timer2 Interrupt Flag (TMR2IF) and do not clear the ECCPASE bit until TMR2IF is set.

3. Module: ECCP

ECCP1, configured for auto-shutdown with Comparator 1, corrupts the PWM duty cycle pulse. In addition, it does not consistently synchronize the pulse to the beginning of the period, and the end of the pulse can occur at any time within the period.

Work around

None.

4. Module: ECCP

The auto-shutdown event will cause the ECCP pins (P1A, P1B, P1C, P1D) to draw higher current than expected. This occurs when the ECCPAS1 or ECCPAS0 bits are set and an auto-shutdown event occurs.

Work around

None.

5. Module: ECCP

The auto-shutdown source, FLT0, has inverse polarity from the description in Section 16.4.7 ìEnhanced PWM Auto-Shutdownî of the Device Data Sheet. A logic, high-voltage level on FLT0 will generate a shutdown on ECCP1.

Work around

Invert the logic in the programís source code.

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