NEC V850ES/F 3-L Series User Manual page 407

32-bit single-chip microcontroller

Table of Contents

Asynchronous Serial Interface (UARTD)

RXDDn (input)

Reception interrupt (INTUDnR)

Edge detection

Capture timer

A transmission enable interrupt request signal (INTUDnT) is output at the

start of each transmission. The INTUDnT signal is also output at the start

of each SBF transmission.

LIN reception manipulation outline

The wakeup signal is sent by the pin edge detector, UARTDn is enabled,

and the SBF reception mode is set.

Upon detection of the SBF reception of 11 or more bits, normal SBF

reception end is judged. When the SBF reception mode selection bit

(UDnSRS) is set to "0", the receive completion interrupt request signal

(INTUDnR) is generated, and when the UDnSRS is set to "1", the status

interrupt request signal (INTUDnS) is generated. Upon detection of SBF

reception of less than 11 bits, an SBF reception error is judged, no

interrupt signal is output, and the mode returns to the SBF reception mode.

When SBF reception ends normally, if the SBF reception mode selection

bit (UDnSRS) is "0", the receive completion interrupt request signal

(INTUDnR) is generated, and if the UDnSRS is "1", the status interrupt

request signal (INTUDnS) is generated and the SBF reception success

flag (UDnSSF) is set. If the SBF reception trigger bit (UDnSRT) is "1", the

error detection for the overrun, parity, and framing (UDnOVE, UDnPE,

UDnFE) is not performed during the SBF reception. Moreover, the data

transfer from the receive shift register to the receive data register (UDnRX)

is not performed, either. At this time, the UDnRX holds the prior value.

The RXDDn pin is connected to TI (capture input) of the timer, the transfer

rate is calculated, and the baud rate error is calculated. The value of the

UDnCTL2 register obtained by correcting the baud rate error after dropping

UARTD enable is set again, causing the status to become the reception

User's Manual U18743EE1V2UM00

SF reception

ID reception

transmission

transmission

Data transmission