26
8Bit Single Chip Microcontroller
DMC73C168
SCLK1E :
SIO1 clock enable bit
This read/write bit determines PORT E2 bit is SIO1 clock output pin or not
0 = PORT E2 is normal I/O port
1 = PORT E2 is assigned SIO1 clock output pin when "CKSRC1" is set.
(Then, PORT E2 direction should be output)
SO1ENA :
Serial output enable bit
This read/write bit determines PORT E0 is SO1 pin or not
0 = PORT E0 is normal I/O port
1 = PORT E0 is assigned SO1 pin (Then, PORT E0 direction should be output state)
PF NAME : SIO1BUF
R/W
: SERIAL I/O 1 DATA REGISTER
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
X
BIT 0
X
P28
READ
SIO1 RECEIVING DATA
>011C WRITE
RESET VALUE
SIO1 TRANSMITTING DATA
X
X
X
X
X
X
X : INDETERMINATOR
PF NAME : SIO2CTL
: SERIAL I/O 2 CONTROL REGISTER
BIT 6 BIT 5 BIT 4 BIT 3
R/W
BIT 7
BIT 2
BIT 1
BIT 0
P29
READ
SIO2AF CKSRC2 BAU21 BAU20 SIO2EF SCLK2E SO2ENA
SIO2EC SCLK2E SO2ENA
X
X
X
>011D WRITE SIO2ST CKSRC2
RESET VALUE
O
O
O
O
O
O
O
SIO2AF
SIO2ST
:
:
SIO2 Operation flag bit.
This read bit determines SIO2 is enabled or not.
0 = SIO2 is stop state
1 = SIO2 is processing state
SIO2 start enable bit.
This write bit determines SIO2 is start or not
0 = SIO2 is stop
1 = SIO2 is start
* Caution : This bit should be reset to "0" before 8bit transmition for proper SIO
operation.
CKSRC2 :
SIO2 clock source selection bit
This read/write bit determines SIO2 clock source in from external or internal
0 = SIO2 clock is from internal
1 = SIO2 clock is from external
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