DSPIC33FJMC202ESS datasheet(194/330 Pages) MICROCHIP

194 / 330 page

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304

DS70283K-page 194

19.1

UART Helpful Tips

In multi-node direct-connect UART networks,

UART

receive

inputs

react

the

complementary logic level defined by the

URXINV bit (UxMODE<4>), which defines the

idle state, the default of which is logic high, (i.e.,

URXINV = 0). Because remote devices do not

initialize at the same time, it is likely that one of

the devices, because the RX line is floating, will

trigger a start bit detection and will cause the

first byte received after the device has been ini-

tialized to be invalid. To avoid this situation, the

user should use a pull-up or pull-down resistor

on the RX pin depending on the value of the

URXINV bit.

a) If URXINV = 0, use a pull-up resistor on the

RX pin.

b) If URXINV = 1, use a pull-down resistor on

the RX pin.

The first character received on a wake-up from

Sleep mode caused by activity on the UxRX pin

of the UART module will be invalid. In Sleep

mode, peripheral clocks are disabled. By the

time the oscillator system has restarted and

stabilized from Sleep mode, the baud rate bit

sampling clock relative to the incoming UxRX bit

timing is no longer synchronized, resulting in the

first character being invalid. This is to be

expected.

19.2

UART

Resources

Many useful resources are provided on the main prod-

uct page of the Microchip web site for the devices listed

in this data sheet. This product page, which can be

accessed using this link, contains the latest updates

and additional information.

19.2.1

KEY RESOURCES

• Section 17. “UART” (DS70188)

• Code Samples

• Application Notes

• Software Libraries

• Webinars

• All related dsPIC33F/PIC24H Family Reference

Manuals Sections

• Development Tools

Note:

In the event you are not able to access

the product page using the link above,

enter

this

URL

your

browser:

http://www.microchip.com/wwwproducts/

Devices.aspx?dDocName=en530334

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