Information

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller SPDIP 28 16-Bit 32 MHz I/O number 24

PIC24FV32KA304 FAMILY

DS80000522E-page 4  2011-2013 Microchip Technology Inc.

4. Module: UART (TX Buffer)

If the transmit buffer is filled sequentially with

four characters, the characters may not be

transmitted in the correct order.

Work around

Do not completely fill the buffer before transmit-

ting data; send three characters or less at a

time.

Affected Silicon Revisions

5. Module: UART (Transmit)

The UARTx Transmit Buffer Full flag, UTXBF

(UxSTA<9>), may become cleared before data

starts moving out of the full buffer. If the flag is

used to determine when data can be written to

the buffer, new data may not be accepted and

data may not be transmitted.

Work around

Poll the Transmit Buffer Empty flag (TRMT,

UxSTA<8>) to determine when the transmit

buffer is empty and can be written to.

Alternatively, configure the UART to set the

UARTx Transmit Interrupt Flag (UxTXIF) when-

ever a character is shifted into the Transmit Shift

mit interrupt occurs, this indicates that at least

one buffer position is open and that the buffer

can be written to.

Affected Silicon Revisions

6. Module: A/D (Threshold Detect)

In Auto-Scan mode, with low power enabled

(AD1CON5<15> = 1, AD1CON5<14> = 1) and

the device in Sleep mode, the ADRC may not

turn off between scans, resulting in a higher

current draw than anticipated.

Work around

None.

Affected Silicon Revisions

7. Module: A/D (Threshold Detect)

In Auto-Scan mode (AD1CON5<15> = 1), when

the Auto-Scan Interrupt mode bits are set to ‘11’

(AD1CON5<9:8> = 11), the highest number

channel selected for scanning in AD1CSSL or

AD1CSSH may not trigger an interrupt on a valid

comparison.

Work around

Add a dummy channel to the scanning sequence.

For example, when scanning AN0 and AN1, set

AD1CSSL to 0x0007 or 0x8003, or whatever is

practical given the implementation.

Also, if the highest number channel needs to be

scanned, the AD1CHITH register can be polled

to observe a valid comparison.

Affected Silicon Revisions

A4 A6