INTERNAL SPECIFICATIONS994.6 Serial Port4.6.1 OutlineMSM80C154S/MSM83C154S is equipped with a serial port which can be used in I/Oextension and UART (Universal Asynchronous Receiver/Transmitter) applications.I/O extension mode• Input and output of 8-bit serial data synchronized with the MSM80C154S/MSM83C154Soutput clock.UART mode• Independent transmitter and receiver circuits for full duplex communication.• Double buffer in receiver circuit to provide a 1-frame time margin in processing receiveddata.• Selection of 10-bit and 11-bit frame lengths.• Easier baud rate selection than in MSM80C31F/MSM80C51F• Setting of different baud rates for transmitting and receiving possible Multi-processorsystem applications possible in 11-bit frame mode Framing and overrun error detectfunctionSee Figure 4-27 for serial port block diagram.
