TMPM330 - Keil

9.3.8 Transmit Counter
9.3.9 Transmit Control Unit
Under development
TMPM330 (rev 0.4) 9-18
TMPM330
The transmit counter is a 4-bit binary counter used in the asynchronous communication
(UART) mode. It is counted by SIOCLK as in the case of the receive counter and generates
a transmit clock (TXDCLK) on every 16th clock pulse.
SIOCLK
15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2
TXDCLK
• I/O interface mode:
Fig. 9-5 Transmit Clock Generation
In the SCLK output mode with SC0CR set to “0,” each bit of data in the transmit
buffer is output to the TXD0 pin on the rising edge of the shift clock output from the
SCLK0 pin.
In the SCLK input mode with SC0CR set to “1,” each bit of data in the transmit
buffer is output to the TXD0 pin on the rising or falling edge of the input SCLK signal
according to the SC0CR setting.
• Asynchronous (UART) mode:
When the CPU writes data to the transmit buffer, data transmission is initiated on the
rising edge of the next TXDCLK and the transmit shift clock (TXDSFT) is also generated.
Serial Channel (SIO)