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CHAPTER 15 UART1
asynchronous multiprocessor mode (SMR1 register bit 7, 6: MD1, MD0 = "01B" is set. Select operation
mode 1 (asynchronous multiprocessor mode) and use it as the master. For this connection, select no
parity 8-bit data length.
G
Synchronous type
For the operation modes, either the asynchronous mode (start-stop synchronization) or the clock-
synchronous mode can be selected.
G
Signal type
The UART1 can only handle the NRZ (Non Return to Zero) data format.
G
Start of transmission/reception
• Transmission starts when the transmission enable bit of the serial control register (SCR1 register bit 8:
TXE) is set to "1".
• Reception starts when the reception enable bit of the serial control register (SCR1 register bit 9: RXE) is
set to "1".
G
Stop of transmission/reception
• Transmission stops when the transmission enable bit of the serial control register (SCR1 register bit 8:
TXE) is set to "0".
• Reception stops when the reception enable bit of the serial control register (SCR1 register bit 9: RXE) is
set to "0".
G
Stop during transmission/reception
• When reception is disabled during receiving (during data input to reception shift register) (SCR1
register bit 9: RXE = 0), reception stops after reception of the frame being received is completed and the
receive data is stored to the serial input data register 1 (SIDR1).
• When transmission is disabled during transmission (during data output from the transmission shift
register) (SCR1 register bit 8: TXE = 0), transmission stops after transmission of one frame to the
transmission shift register from the serial output data register 1 (SODR1).
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