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The serial interface control and serial data can be accessed by the IN2 and OUT2 instructions with
operands [C
= 3H~6H].
N
The serial interface pins can also function as I/O port 4 pins: P4-0, P4-1, and P4-2. Setting the SIO ON
bit to "1" sets these I/O port 4 pins as the SI, SO, and SCK pins, respectively.
(1)
SCK
-
INV
,
SCK
-
The
SCK
-
INV
SCK Pin State
INV
Input/Output
I/
O
0
0
Output
1
0
Output
1
Input
*
(2)
Edge bit
The edge bit sets the serial data shift logic as follows.
•
When edge = "0"
When the edge bit is set to "0", the data are output from SO on the rising edge of the SCK
clock. The SI input is also input to the shift register on the rising edge of the SCK clock.
I/
O
bits
and
SCK
-
I/
O
bits set the input/output format as follows.
SCK Clock
Waveform
40
TC9314F
2003-07-03
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