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INTERNAL SPECIFICATIONS

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.

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Oki MSM85C154HVS Specifications

General