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UART S3C84E5/C84E9/P84E9
13-14
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
Master
S3C84E5/
C84E9/
P84E9
TxD
RxD
Slave 1
TxD RxD
Slave 2
TxD
RxD
Slave n
S3C84E5/
C84E9/
P84E9
S3C84E5/
C84E9/
P84E9
S3C84E5/
C84E9/
P84E9
Figure 13-9. Connection Example for Multiprocessor Serial Data Communications