Information

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 from at anytime.
This register must only be written to when C7816[ISO_7816E] is not set.
Addresses: UART0_WF7816 is 4006_A000h base + 1Dh offset = 4006_A01Dh
UART1_WF7816 is 4006_B000h base + 1Dh offset = 4006_B01Dh
UART2_WF7816 is 4006_C000h base + 1Dh offset = 4006_C01Dh
UART3_WF7816 is 4006_D000h base + 1Dh offset = 4006_D01Dh
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
This field is used as another multiplier in the calculation of WT and BWT. This values 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 only be written when C7816[ISO_7816E] is not set.
Addresses: UART0_ET7816 is 4006_A000h base + 1Eh offset = 4006_A01Eh
UART1_ET7816 is 4006_B000h base + 1Eh offset = 4006_B01Eh
UART2_ET7816 is 4006_C000h base + 1Eh offset = 4006_C01Eh
UART3_ET7816 is 4006_D000h base + 1Eh offset = 4006_D01Eh
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
Table continues on the next page...
Chapter 48 Universal Asynchronous Receiver/Transmitter (UART)
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc. 1333