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INTERNAL SPECIFICATIONS
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4.6 Serial Port
4.6.1 Outline
MSM80C154S/MSM83C154S is equipped with a serial port which can be used in I/O
extension and UART (Universal Asynchronous Receiver/Transmitter) applications.
I/O extension mode
• Input and output of 8-bit serial data synchronized with the MSM80C154S/MSM83C154S
output 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 received
data.
• 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-processor
system applications possible in 11-bit frame mode Framing and overrun error detect
function
See Figure 4-27 for serial port block diagram.