Information

PIC18F2525/2620/4525/4620
DS80200D-page 6 © 2006 Microchip Technology Inc.
18. Module: EUSART
When performing back-to-back transmission in 9-bit
mode (TX9D bit in the TXSTA register is set), the
second byte may be corrupted if it is written into
TXREG immediately after the TMRT bit is set.
Work around
Execute a software delay, at least one half the
transmission’s bit time, after TMRT is set and prior
to writing subsequent bytes into TXREG.
Date Codes that pertain to this issue:
All engineering and production devices.
19. Module: Timer1/Timer3
When Timer1 or Timer3 is configured for the
external clock source and the CCPxCON register
is configured with 0x0B (Compare mode, trigger
special event), the timer is not reset on a Special
Event Trigger.
Work around
Modify firmware to reset the Timer registers upon
detection of the compare match condition —
TMRxL and TMRxH.
Date Codes that pertain to this issue:
All engineering and production devices.
20. Module: Timer1/Timer3
When Timer1 or Timer3 is in External Clock
Synchronized mode and the external clock period
is between 1 and 2 T
CY, interrupts will occasionally
be skipped.
Work around
Avoid using an external clock with a period (1/
frequency) between 1 and 2 T
CY.
Date Codes that pertain to this issue:
All engineering and production devices.
21. Module: Timer1/Timer3
When Timer1/Timer3 is operating in 16-bit mode
and the prescale setting is not 1:1, a write to the
TMR1H/TMR3H Buffer registers may lengthen the
duration of the period between the increments of
the timer for the period in which TMR1H/TMR3H
were written.
Work around
Two work arounds are available: 1) Stop Timer1/
Timer3 before writing the TMR1H/TMR3H regis-
ters; 2) Write TMR1L/TMR3L immediately after
writing TMR1H/TMR3H.
Date Codes that pertain to this issue:
All engineering and production devices.
22. Module: MSSP
I
2
C Receive mode should be enabled (i.e., RCEN
bit should be set) only when the system is idle
(i.e., when ACKEN, RCEN, PEN, RSEN and SEN
all equal zero). It should not be possible to set the
RCEN bit when the system is not idle, however,
the RCEN bit can be set under this circumstance.
Work around
Wait for the system to become idle before setting the
RCEN bit. This requires a check for the following bits
to be clear:
ACKEN, RCEN, PEN, RSEN and SEN.
Date Codes that pertain to this issue:
All engineering and production devices.