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S3C9228/P9228 CONTROL REGISTERS
4-33
SIOCON — SIO Control Register E1H
Bit Identifier .7 .6 .5 .4 .3 .2 .1 .0
RESETRESET Value
0 0 0 0 0 0 0 –
Read/Write
R/W R/W R/W R/W R/W R/W R/W –
.7 SIO Shift Clock Selection Bit
0 Internal clock (P.S clock)
1 External clock (SCK)
.6 Data Direction Control Bit
0 MSB-first mode
1 LSB-first mode
.5 SIO Mode Selection Bit
0 Receive-only mode
1 Transmit/receive mode
.4 Shift Clock Edge Selection Bit
0 Tx at falling edges, Rx at rising edges
1 Tx at rising edges, Rx at falling edges
.3 SIO Counter Clear and Shift Start Bit
0 No action
1 Clear 3-bit counter and start shifting
.2 SIO Shift Operation Enable Bit
0
Disable shifter and clock counter
1
Enable shifter and clock counter
.1 SIO Interrupt Enable Bit
0
Disable SIO interrupt
1
Enable SIO interrupt
.0
Not used for S3C9228/P9228