PIC24EP64MC204-E/PT Microchip Technology, PIC24EP64MC204-E/PT Datasheet - Page 282

• Manufacturer Part Number: PIC24EP64MC204-E/PT
• Description: 16 Bit MCU, 64KB Flash, 8KB RAM, 60 MHz, 44 Pin, MCPWM,QEI, 3 OpAmp, 4 Comp, PTG
• Manufacturer: Microchip Technology

dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X, AND PIC24EPXXXGP/MC20X
20.1
1.
2.
DS70657F-page 282
In multi-node direct-connect UART networks,
UART
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)
b)
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.
UART Helpful Tips
If URXINV = 0, use a pull-up resistor on the
RX pin.
If URXINV = 1, use a pull-down resistor on
the RX pin.
receive
inputs
react
to
the
20.2
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.
20.2.1
• Section 17. “UART” (DS70582)
• Code Samples
• Application Notes
• Software Libraries
• Webinars
• All related dsPIC33E/PIC24E Family Reference
• Development Tools
Note:
Manuals Sections
UART Resources
In the event you are not able to access the
product page using the link above, enter
this URL in your browser:
http://www.microchip.com/wwwproducts/
Devices.aspx?dDocName=en555464
KEY RESOURCES
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