TL16C752CI-Q1_16 Datasheet, PDF (32/57 Pages) Texas Instruments – Dual UART

TL16C752CI-Q1
SLLSEQ9A – OCTOBER 2015 – REVISED FEBRUARY 2016
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8.5.2 Receiver Holding Register (RHR)
The receiver section consists of the RHR and the receiver shift register (RSR). The RHR is actually a 64-byte
FIFO. The RSR receives serial data from RX terminal. The data is converted to parallel data and moved to the
RHR. The receiver section is controlled by the line control register. If the FIFO is disabled, location 0 of the FIFO
is used to store the characters. If overflow occurs, characters are lost. The RHR also stores the error status bits
associated with each character.
8.5.3 Transmit Holding Register (THR)
The transmitter section consists of the THR and the transmitter shift register (TSR). The transmit holding register
is actually a 64-byte FIFO. The THR receives data and shifts it into the TSR where it is converted to serial data
and moved out on the TX terminal. If the FIFO is disabled, location 0 of the FIFO is used to store the byte.
Characters are lost if overflow occurs.
8.5.4 FIFO Control Register (FCR)
This is a write-only register which is used for enabling the FIFOs, clearing the FIFOs, setting transmitter and
receiver trigger levels, and selecting the type of DMA signaling. Table 8 shows FIFO control register bit settings.
Table 8. FCR Bit Settings
BIT
0
1
2
3
5:4 ⁽¹⁾
7:6
BIT SETTINGS
0 = Disable the transmit and receive FIFOs
1 = Enable the transmit and receive FIFOs
0 = No change
1 = Clears the receive FIFO and resets its counter logic to 0. Returns to 0 after clearing FIFO.
0 = No change
1 = Clears the transmit FIFO and resets its counter logic to 0. Returns to 0 after clearing FIFO.
0 = DMA mode 0
1 = DMA mode 1
Sets the trigger level for the TX FIFO:
00 – 8 spaces
01 – 16 spaces
10 – 32 spaces
11 – 56 spaces
Sets the trigger level for the RX FIFO:
00 – 1 characters
01 – 4 characters
10 – 56 characters
11 – 60 characters
(1) FCR[5−4] can be modified and enabled only when EFR[4] is set. This is because the transmit trigger level is regarded as an enhanced
function.
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