Samsung 8-Bit CMOS Microcontroller, S3C9228/P9228 user manual Siocon SIO Control Register

S3C9228/P9228CONTROL REGISTERS

SIOCON — SIO Control Register E1H

Bit Identifier

RESET Value

Read/Write

.7

.6

.5

.4

.3

.2

.1

.7	.6	.5	.4	.3	.2	.1	.0
0	0	0	0	0	0	0	–
R/W	R/W	R/W	R/W	R/W	R/W	R/W	–

SIO Shift Clock Selection Bit

0Internal clock (P.S clock)

1External clock (SCK)

Data Direction Control Bit

0MSB-first mode

1LSB-first mode

SIO Mode Selection Bit

0Receive-only mode

1Transmit/receive mode

Shift Clock Edge Selection Bit

0Tx at falling edges, Rx at rising edges

1Tx at rising edges, Rx at falling edges

SIO Counter Clear and Shift Start Bit

0No action

1Clear 3-bit counter and start shifting

SIO Shift Operation Enable Bit

0Disable shifter and clock counter

1Enable shifter and clock counter

SIO Interrupt Enable Bit

0Disable SIO interrupt

1Enable SIO interrupt

.0

Not used for S3C9228/P9228

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