Samsung C8249, P8245, P8249, S3C8245 - page 297

SERIAL I/O INTERFACE S3C8245/P8245/C8249/P8249
16-2
SIO CONTROL REGISTER (SIOCON)
The control register for serial I/O interface module, SIOCON, is located at F0H in set 1, bank 0. It has the control
settings 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.
Serial I/O Module Control Registers (SIOCON)
F0H, Set 1, Bank 0, R/W
.7 .6 .5 .4 .3 .2 .1 .0MSB LSB
SIO interrupt enable bit
0 = Disable SIO interrupt
1 = Enable SIO interrupt
SIO interrupt pending bit
0 = No interrupt pending
0 = Clear pending condition
(when write)
1 = Interrupt is pending
SIO shift operation enable bit
0 = Disable shifter and clock counter
1 = Enable shifter and clock counter
Shift clock edge selection bit
0 = T X at falling edeges, Rx at rising edges
1 = T X at rising edeges, Rx at falling edges
Data direction control bit
0 = MSB-first mode
1 = LSB-first mode
SIO mode selection bit
0 = Receive only mode
1 = Transmit/receive mode
SIO counter clear and shift start bit
0 = No action
1 = Clear 3-bit counter and start shifting
SIO shift clock selection bit
0 = Internal clock (P.S Clock)
1 = External clock (SCK)
Figure 16-1. Serial I/O Module Control Registers (SIOCON)