25
8Bit Single Chip Microcontroller
DMC73C168
6) SERIAL I/O REGISTERS
PF NAME : SIO1CTL
R/W
: SERIAL I/O 1 CONTROL REGISTER
BIT 6 BIT 5 BIT 4 BIT 3
BIT 7
BIT 2
BIT 1
BIT 0
P27
>011B WRITE SIO1ST CKSRC1
RESET VALUE
READ SIO1AF CKSRC1 BAU11 BAU10 SIO1EF SCLK1E SO1ENA
X
X
X
SIO1EC SCLK1E SO1ENA
O
O
O
O
O
O
O
SIO1AF
:
SIO1 operation flag bit.
This read bit determines SIO1 is enabled or not.
0 = SIO1 is stop state
1 = SIO1 is processing state
SIO1ST
:
SIO1 start enable bit
This write bit determines SIO1 is start or not.
0 = SIO1 is stop
1 = SIO1 is started
* Caution : This bit should be reset to "0" before 8bit transmition for proper SIO
operation.
CKSRC1 :
SIO1 clock source selection bit
This read/write bit determines SIO1 clock source in from external or internal.
0 = SIO1 clock is from internal
1 = SIO1 clock is from external
BAU1n
:
SIO1 transmission speed select bits.
This read/write bits determine SIO1 transmission speed.
BAU11 BAU10
SCLK FREQ. (Fosc = 4.5MKHz)
0
0
1
1
0
1
0
1
Fosc/8
=
=
=
=
563 KHz
281 KHz
141 KHz
70 KHz
Fosc/16
Fosc/32
Fosc/64
SIO1EF
:
Transmission error flag bit
This read bit shows overrun error was occured or not
0 = Overrun error is not occured
1 = Overrun error is occured
SIO1EC :
Transmission error flag clear bit
This write bit determines transmission error flag is cleared or not
0 = Transmission error flag is not affected
1 = Transmission error flag is cleared
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