TMPM330 - Keil

9.3.10 Transmit FIFO Buffer
Under development
TMPM330 (rev 0.4) 9-21
TMPM330
In addition to the double buffer function already described, data may be stored using the
transmit FIFO buffer. By setting of the SC0FCNF register and of the
SC0MOD1 register, the 4-byte transmit buffer can be enabled. In the UART mode or I/O
interface mode, up to 4 bytes of data may be stored.
If data is to be transmitted with a parity bit in the UART mode, parity check must be performed
on the receive side each time a data frame is received.
9.3.11 Transmit FIFO Operation
I/O interface mode with SCLK output (normal mode):
TX FIFO
Transmit buffer 2
Transmit buffer 1
The following example describes the case a 4-byte data stream is transmitted:
SC0TFC = 01: Clears transmit FIFO and sets the condition of interrupt generation
SC0TFC = 00: Sets the interrupt to be generated at fill level 0.
SC0FCNF = 01011: Inhibits continued transmission after reaching the fill level.
In this condition, data transmission can be initiated by setting the transfer mode to half
duplex, writing 4 bytes of data to the transmit FIFO, and setting the bit to “1.”
When the last transmit data is moved to the transmit buffer, the transmit FIFO interrupt is
generated. When transmission of the last data is completed, the clock is stopped and the
transmission sequence is terminated.
TBEMP
INTTX0
TXE
Data 6
Data 5
Data 4
Data 3
Data 2
Data 1
Data 6
Data 5 Data 6
Data 4 Data 5 Data 6
Data 3 Data 4 Data 5 Data 5
Data 2 Data 3 Data 4
Fig. 9-8 Transmit FIFO Operation
Data 6
Serial Channel (SIO)