Samsung S3C9228/P9228 SIO Control Registers Siocon, Serial I/O Module Control Register Siocon

SERIAL I/O INTERFACE S3C9228/P9228

SIO CONTROL REGISTERS (SIOCON)

The control register for serial I/O interface module, SIOCON, is located at E1H in page 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.

MSB

Serial I/O Module Control Register (SIOCON)

E1H, Page 0, R/W

.7 .6 .5 .4 .3 .2 .1 .0

LSB

SIO shift clock selection bit:				Not used
0 = Internal clock (P.S Clock)
			SIO interrupt enable bit:
1 = External clock (SCK)
			0 = Disable SIO interrupt
			1 = Enable SIO interrupt
Data direction control bit:
0 = MSB-first mode
		SIO shift operation enable bit:
1 = LSB-first mode
		0 = Disable shifter and clock counter
SIO mode selection bit:		1 = Enable shifter and clock counter
0 = Receive only mode
	SIO counter clear and shift start bit:
1 = Transmit/receive mode
	0 = No action
	1 = Clear 3-bit counter and start shifting

Shift clock edge selection bit:

0 = tX at falling edeges, rx at rising edges. 1 = tX at rising edeges, rx at falling edges.

Figure 15-1. Serial I/O Module Control Register (SIOCON)

15-2