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CHAPTER 14 SERIAL INTERFACE CHANNEL 1
267
User
’
s Manual U11302EJ4V0UM
Figure 14-5. Format of Automatic Data Transmit/Receive Interval Specification Register (2/2)
Data transfer interval specification (f
X
= 5.0 MHz operation)
ADTI4 ADTI3 ADTI2 ADTI1 ADTI0
Minimum
Note
Maximum
Note
1
0
0
0
0
446.4
μ
s + 0.5/f
SCK
449.6
μ
s + 1.5/f
SCK
1
0
0
0
1
472.0
μ
s + 0.5/f
SCK
475.2
μ
s + 1.5/f
SCK
1
0
0
1
0
497.6
μ
s + 0.5/f
SCK
500.8
μ
s + 1.5/f
SCK
1
0
0
1
1
523.2
μ
s + 0.5/f
SCK
526.4
μ
s + 1.5/f
SCK
1
0
1
0
0
548.8
μ
s + 0.5/f
SCK
552.0
μ
s + 1.5/f
SCK
1
0
1
0
1
574.4
μ
s + 0.5/f
SCK
577.6
μ
s + 1.5/f
SCK
1
0
1
1
0
600.0
μ
s + 0.5/f
SCK
603.2
μ
s + 1.5/f
SCK
1
0
1
1
1
625.6
μ
s + 0.5/f
SCK
628.8
μ
s + 1.5/f
SCK
1
1
0
0
0
651.2
μ
s + 0.5/f
SCK
654.4
μ
s + 1.5/f
SCK
1
1
0
0
1
676.8
μ
s + 0.5/f
SCK
680.0
μ
s + 1.5/f
SCK
1
1
0
1
0
702.4
μ
s + 0.5/f
SCK
705.6
μ
s + 1.5/f
SCK
1
1
0
1
1
728.0
μ
s + 0.5/f
SCK
731.2
μ
s + 1.5/f
SCK
1
1
1
0
0
753.6
μ
s + 0.5/f
SCK
756.8
μ
s + 1.5/f
SCK
1
1
1
0
1
779.2
μ
s + 0.5/f
SCK
782.4
μ
s + 1.5/f
SCK
1
1
1
1
0
804.8
μ
s + 0.5/f
SCK
808.0
μ
s + 1.5/f
SCK
1
1
1
1
1
830.4
μ
s + 0.5/f
SCK
833.6
μ
s + 1.5/f
SCK
Note
The data transfer interval includes an error. The data transfer minimum and maximum intervals
are found from the following expressions (n: Value set in ADTI0 to ADTI4). However, if the
minimum calculated by the following expression is smaller than 2/f
SCK
, the minimum interval time
is 2/f
SCK
.
2
7
f
X
56
f
X
0.5
f
SCK
Minimum = (n + 1)
×
+
+
2
7
f
X
72
f
X
1.5
f
SCK
Maximum = (n + 1)
×
+
+
Cautions 1. ADTI should not be written to during operation of the automatic transmit/receive
function.
2. Bits 5 and 6 must be set to 0.
3. When ADTI is used to control the interval time of data transfer by automatic transmit/
receive function, busy control (refer to 14.4.3 (4) (a) Busy control option) is invalid.
Remarks 1.
f
X
:
Main system clock oscillation frequency
2.
f
SCK
: Serial clock frequency
6
5
4
3
2
1
0
7
Symbol
ADTI ADTI7
0
0
ADTI4 ADTI3 ADTI2 ADTI1 ADTI0
FF6BH 00H R/W
Address After reset R/W