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Example: Program to stop data transmission (when an external clock is used)
<SIOS>
<SIOF>
<SEF>
SCK pin (output)
SO pin
INTSBI interrupt
request
SBI0DBR
Write transmitted data
<SIOS>
<SIOF>
<SEF>
SCK pin (input)
SO pin
INTSBI interrupt
request
SBI0DBR
Write transmitted data
STEST1: BIT
STEST2: BIT
*
a
a
a
a
a
0
1
2
3
4
a
b
a
a
a
a
a
*
0
1
2
3
4
a
b
Figure 3.10.26 Transfer Mode
SEF, (SBI0SR)
JR NZ, STEST1
0, (P6)
JR Z, STEST2
LD
(SBI0CR1), 00000111B
91C824-175
a
a
a
b
b
b
5
6
7
0
1
2
(a) Internal clock
Clear <SIOS>
a
a
a
b
b
b
5
6
7
0
1
2
(b) External clock
; If <SEF> = 1 then loop
; If SCK ]= 0 then loop
; <SIOS> ← 0
TMP91C824
Clear<SIOS>
b
b
b
b
b
3
4
5
6
7
b
b
b
b
b
3
4
5
6
7
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