Samsung C8274X Manuel D’Utilisation
S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X
CONTROL
REGISTER
4-41
SIOCON
— SIO Control Register
E1H
Set 1, Bank 0
Bit
Identifier
.7 .6 .5 .4 .3 .2 .1 .0
Reset Value
0 0 0 0 0 0 0 0
Read/Write
R/W R/W R/W R/W R/W R/W R/W R/W
Addressing Mode
Register addressing mode only
.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
SIO Interrupt Pending Bit
0
No interrupt pending (when read), Clear pending bit (when write)
0
Interrupt is pending (when read)