PIC18F8490 Datasheet, PDF (4/10 Pages) Microchip Technology – PIC18F6390/6490/8390/8490 Rev.B3 SILICON ERRATA

PIC18F6390/6490/8390/8490
8. Module: A/D
The A/D offset is greater than the specified limit in
Table 26-23 of the Device Data Sheet. The addi-
tion of Parameter A06A and updated conditions
and limits are shown in bold text in Table 2.
Work around
Three work arounds exist.
1. Configure the A/D to use the VREF+ and VREF-
pins for the voltage references. This is done by
setting the VCFG<1:0> bits (ADCON1<5:4>).
2. Perform a conversion on a known voltage
reference voltage and adjust the A/D result in
software.
3. Increase system clock speed to 40 MHz and
adjust A/D settings accordingly. Higher system
clock frequencies decrease offset error.
TABLE 2: A/D CONVERTER CHARACTERISTICS: PIC18F6390/6490/8390/8490 (INDUSTRIAL)
PIC18LF6390/6490/8390/8490 (INDUSTRIAL)
Param
No.
Symbol
Characteristic
Min
Typ
Max Units
Conditions
A06A EOFF
A06 EOFF
Offset Error
Offset Error
—
—
<±1.5 LSb VREF = VREF+ and VREF-
—
—
<±3.5
LSb VREF = VSS and VDD
Date Codes that pertain to this issue:
All engineering and production devices.
9. Module: BOD
The BOD module may reset below the minimum
operating voltage of the device when configured
for BORV1:BORV0 = 11. The updated Reset
voltage specifications are shown in bold in
Table 3.
TABLE 3: BROWN-OUT RESET VOLTAGE
Param
No.
Sym
Characteristic
Min Typ Max Unit
D005 VBOR Brown-out Reset Voltage
PIC18LF6390/6490/8390/8490
BORV1:BORV0 = 11 N/A 2.05 N/A V
Work around
Use the next higher BOD voltage setting to ensure
a low VDD is detected above 2.0V.
Date Codes that pertain to this issue:
All engineering and production devices.
10. Module: EUSART
When performing back-to-back transmission in
9-bit mode (TX9D bit in the TXSTAx register is
set), an ongoing transmission’s timing can be
corrupted if the TX9D bit (for the next trans-
mission) is not written immediately following the
setting of TXxIF. This is because any write to
the TXSTAx register results in a reset of the
Baud Rate Generator which will effect any
ongoing transmission.
Work around
Load TX9D just after TXxIF is set, either by polling
TXxIF or by writing TX9D at the beginning of the
Interrupt Service Routine, or only write to TX9D
when a transmission is not in progress
(TRMT = 1).
Date Codes that pertain to this issue:
All engineering and production devices.
DS80207B-page 4
© 2005 Microchip Technology Inc.