Information

UARTx_WN7816 field descriptions
Field Description
7–0
GTN
Guard Band N
Defines a parameter used in the calculation of GT, CGT, and BGT counters. The value represents an
integer number between 0 and 255. See Wait time and guard time parameters .
48.3.29 UART 7816 Wait FD Register (UARTx_WF7816)
The WF7816 contains parameters that are used in the generation of various counters
including GT, CGT, BGT, WT, and BWT. This register may be read at any time. This
register must be written to only when C7816[ISO_7816E] is not set.
Address: Base address + 1Dh offset
Bit 7 6 5 4 3 2 1 0
Read
GTFD
Write
Reset
0 0 0 0 0 0 0 1
UARTx_WF7816 field descriptions
Field Description
7–0
GTFD
FD Multiplier
Used as another multiplier in the calculation of WT and BWT. This value represents a number between 1
and 255. The value of 0 is invalid. This value is not used in baud rate generation. See Wait time and guard
time parameters and Baud rate generation .
48.3.30 UART 7816 Error Threshold Register (UARTx_ET7816)
The ET7816 register contains fields that determine the number of NACKs that must be
received or transmitted before the host processor is notified. This register may be read at
anytime. This register must be written to only when C7816[ISO_7816E] is not set.
Address: Base address + 1Eh offset
Bit 7 6 5 4 3 2 1 0
Read
TXTHRESHOLD RXTHRESHOLD
Write
Reset
0 0 0 0 0 0 0 0
UARTx_ET7816 field descriptions
Field Description
7–4
TXTHRESHOLD
Transmit NACK Threshold
The value written to this field indicates the maximum number of failed attempts (NACKs) a transmitted
character can have before the host processor is notified. This field is meaningful only when
Table continues on the next page...
Chapter 48 Universal Asynchronous Receiver/Transmitter (UART)
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc.
Preliminary
1309
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