UART

S3C84E5/C84E9/P84E9

 

 

Setup Procedure for Multiprocessor Communications

Follow these steps to configure multiprocessor communications:

1.Set all S3C84E5/C84E9/P84E9 devices (masters and slaves) to UART mode 2 with parity disable.

2.Write the MCE bit of all the slave devices to "1".

3.The master device's transmission protocol is:

First byte: the address identifying the target slave device (9th bit = "1")

Next bytes: data (9th bit = "0")

4.When the target slave receives the first byte, all of the slaves are interrupted because the 9th data bit is "1". The targeted slave compares the address byte to its own address and then clears its MCE bit in order to receive incoming data. The other slaves continue operating normally.

Full-Duplex Multi-S3C84E5/C84E9/P84E9 Interconnect

TxD

RxD

TxD

RxD

TxD

RxD

TxD

RxD

 

Master

 

Slave 1

Slave 2

. . .

Slave n

 

 

 

 

 

 

 

S3C84E5/

S3C84E5/

S3C84E5/

S3C84E5/

 

C84E9/

 

C84E9/

 

C84E9/

 

C84E9/

 

P84E9

 

P84E9

 

P84E9

 

P84E9

Figure 13-9. Connection Example for Multiprocessor Serial Data Communications

13-14

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Samsung Setup Procedure for Multiprocessor Communications, Full-Duplex Multi-S3C84E5/C84E9/P84E9 Interconnect, 13-14