Information

UARTx_RWFIFO field descriptions (continued)
Field Description
receive FIFO/buffer size as indicated by PFIFO[RXFIFOSIZE] and PFIFO[RXFE] and must be greater
than 0.
45.3.22 UART FIFO Receive Count (UARTx_RCFIFO)
This is a read only register that indicates how many datawords are currently in the receive
FIFO/buffer. It may be read at any time.
Addresses: UART0_RCFIFO is 4006_A000h base + 16h offset = 4006_A016h
UART1_RCFIFO is 4006_B000h base + 16h offset = 4006_B016h
UART2_RCFIFO is 4006_C000h base + 16h offset = 4006_C016h
Bit 7 6 5 4 3 2 1 0
Read RXCOUNT
Write
Reset
0 0 0 0 0 0 0 0
UARTx_RCFIFO field descriptions
Field Description
7–0
RXCOUNT
Receive Counter
The value in this register indicates the number of datawords that are in the receive FIFO/buffer. If a
dataword is being received, that is, in the receive shift register, it is not included in the count. This value
may be used in conjunction with PFIFO[RXFIFOSIZE] to calculate how much room is left in the receive
FIFO/buffer.
45.3.23 UART 7816 Control Register (UARTx_C7816)
The C7816 register is the primary control register for ISO-7816 specific functionality.
This register is specific to 7816 functionality and the values in this register have no effect
on UART operation and should be ignored if ISO_7816E is not set/enabled. This register
may be read at any time but values must be changed only when ISO_7816E is not set.
Addresses: UART0_C7816 is 4006_A000h base + 18h offset = 4006_A018h
UART1_C7816 is 4006_B000h base + 18h offset = 4006_B018h
UART2_C7816 is 4006_C000h base + 18h offset = 4006_C018h
Bit 7 6 5 4 3 2 1 0
Read 0
ONACK ANACK INIT TTYPE
ISO_7816E
Write
Reset
0 0 0 0 0 0 0 0
Memory map and registers
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
1078 Freescale Semiconductor, Inc.