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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
a
SBI0DBR
Write transmitted data
<SIOS>
<SIOF>
<SEF>
SCK pin (Input)
SO pin
*
INTSBI interrupt
request
SBI0DBR
a
Write transmitted data
STEST1:
BIT 2, (SBI0SR)
JR NZ, STEST1
STEST2:
BIT 0, (P7)
JR Z, STEST2
LD (SBI0CR1), 00000111B
a
a
a
a
a
a
0
1
2
3
4
5
b
a
a
a
a
a
a
a
0
1
2
3
4
5
b
Figure 3.10.26 Transfer Mode
91C824-178
Clear <SIOS>
a
a
b
b
b
b
6
7
0
1
2
3
(a) Internal clock
Clear <SIOS>
a
b
b
b
b
b
6
7
0
1
2
3
(b) External clock
; If <SEF> = 1 then loop
; If SCK = 0 then loop
; <SIOS> ← 0
TMP91C824
b
b
b
b
4
5
6
7
b
b
b
4
5
6
7
2008-02-20
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