Datasheet

Table Of Contents
Value Description
0
NACK is sent on the ISO line for every parity error received.
1
Successive parity errors are counted up to the value specified in CTRLC.MAXITER. These
parity errors generate a NACK on the ISO line. As soon as this value is reached, no
additional NACK is sent on the ISO line.
Bit 16 – INACK Inhibit Not Acknowledge
This bit controls whether a NACK is transmitted when a parity error is received.
This bit is only valid in ISO7816 T=0 mode.
Value Description
0
NACK is transmitted when a parity error is received.
1
NACK is not transmitted when a parity error is received.
Bits 11:10 – HDRDLY[1:0] LIN Master Header Delay
These bits define the delay between break and sync transmission in addition to the delay between the
sync and identifier (ID) fields when in LIN master mode (CTRLA.FORM=0x2).
This field is only valid when using the LIN header command (CTRLB.LINCMD=0x2).
Value Description
0x0
Delay between break and sync transmission is 1 bit time.
Delay between sync and ID transmission is 1 bit time.
0x1
Delay between break and sync transmission is 4 bit time.
Delay between sync and ID transmission is 4 bit time.
0x2
Delay between break and sync transmission is 8 bit time.
Delay between sync and ID transmission is 4 bit time.
0x3
Delay between break and sync transmission is 14 bit time.
Delay between sync and ID transmission is 4 bit time.
Bits 9:8 – BRKLEN[1:0] LIN Master Break Length
These bits define the length of the break field transmitted when in LIN master mode
(CTRLA.FORM=0x2).
Value Description
0x0
Break field transmission is 13 bit times
0x1
Break field transmission is 17 bit times
0x2
Break field transmission is 21 bit times
0x3
Break field transmission is 26 bit times
Bits 2:0 – GTIME[2:0] Guard Time
These bits define the guard time when using RS485 mode (CTRLA.FORM=0x0 or CTRLA.FORM=0x1,
and CTRLA.TXPO=0x3) or ISO7816 mode (CTRLA.FORM=0x7).
For RS485 mode, the guard time is programmable from 0-7 bit times and defines the time that the
transmit enable pin (TE) remains high after the last stop bit is transmitted and there is no remaining data
to be transmitted.
For ISO7816 T=0 mode, the guard time is programmable from 2-9 bit times and defines the guard time
between each transmitted byte.
SAM D5x/E5x Family Data Sheet
SERCOM USART - SERCOM Synchronous and Asyn...
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 952