Sio Control Registers (Siocon); Serial I/O Module Control Register (Siocon) - Samsung S3C8275X User Manual

SERIAL I/O INTERFACE

SIO CONTROL REGISTERS (SIOCON)

The control register for serial I/O interface module, SIOCON, is located at E1H in set 1, bank 0. It has the control
setting for SIO module.
•
Clock source selection (internal or external) for shift clock
•
Interrupt enable
•
Edge selection for shift operation
•
Clear 3-bit counter and start shift operation
•
Shift operation (transmit) enable
•
Mode selection (transmit/receive or receive-only)
•
Data direction selection (MSB first or LSB first)
A reset clears the SIOCON value to "00H". This configures the corresponding module with an internal clock
source at the SCK, selects receive-only operating mode, and clears the 3-bit counter. The data shift operation
and the interrupt are disabled. The selected data direction is MSB-first.
SIO shift clock selection bit:
0 = Internal clock (P.S Clock)
1 = External clock (SCK)
Data direction control bit:
0 = MSB-first mode
1 = LSB-first mode
Shift clock edge selection bit:
0 = T
X
1 = T
X
14-2

Serial I/O Module Control Register (SIOCON)

MSB .7 .6
SIO mode selection bit:
0 = Receive only mode
1 = Transmit/receive mode
at falling edges, Rx at rising edges
at rising edges, Rx at falling edges
Figure 14-1. Serial I/O Module Control Register (SIOCON)
S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X
E1H, Set 1, Bank 0, R/W
.5 .4 .3 .2
SIO shift operation enable bit:
0 = Disable shifter and clock counter
1 = Enable shifter and clock counter
SIO counter clear and shift start bit:
0 = No action
1 = Clear 3-bit counter and start shifting
.1 .0 LSB
SIO interrupt pending bit:
0 = No interrupt pending
0 = Clear pending condition
(when write)
1 = Interrupt is pending
SIO interrupt enable bit:
0 = Disable SIO interrupt
1 = Enable SIO interrupt