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Symbol
7
6
5
ADTI ADTI7
0
0
ADTI7
Data Transfer Interval Control
0
No control of interval by ADTI
1
Control of interval by ADTI (ADTI0 to ADTI4)
ADTI4 ADTI3 ADTI2 ADTI1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
1
0
1
1
0
1
1
0
1
1
Notes 1. The interval is dependent only on CPU processing.
2. 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 a minimum which is calculated by the following expressions is smaller than
2/f
, the minimum interval time is 2/f
SCK
Minimum = (n + 1)
Maximum = (n + 1)
Cautions 1. Do not write to ADTI during operation of the automatic data transmit/receive function.
2. Bits 5 and 6 must be set to 0.
3. When controlling the data transfer interval by automatic transmit/receive using
ADTI, busy control (refer to 19.4.3 (4) (a) Busy control option) becomes invalid.
Remark f
: Main system clock frequency (f
XX
f
: Main system clock oscillation frequency
X
f
: Serial clock frequency
SCK
CHAPTER 19 SERIAL INTERFACE CHANNEL 1
4
3
2
1
ADTI4 ADTI3 ADTI2 ADTI1 ADTI0
Note 1
Data Transfer Interval Specification (f
ADTI0
Minimum
0
0
36.8 s + 0.5/f
µ
0
1
62.4 s + 0.5/f
µ
µ
1
0
88.0 s + 0.5/f
1
1
113.6 s + 0.5/f
0
0
139.2 s + 0.5/f
0
1
164.8 s + 0.5/f
1
0
190.4 s + 0.5/f
1
1
216.0 s + 0.5/f
0
0
241.6 s + 0.5/f
0
1
267.2 s + 0.5/f
1
0
292.8 s + 0.5/f
1
1
318.4 s + 0.5/f
0
0
344.0 s + 0.5/f
0
1
369.6 s + 0.5/f
1
0
395.2 s + 0.5/f
1
1
420.8 s + 0.5/f
6
2
28
+
f
f
XX
XX
6
2
36
+
f
f
XX
XX
0
Address
After Reset
FF6BH
00H
XX
Note 2
SCK
SCK
SCK
µ
SCK
µ
SCK
µ
SCK
µ
SCK
µ
SCK
µ
SCK
µ
SCK
µ
SCK
µ
SCK
µ
SCK
µ
SCK
µ
SCK
µ
SCK
.
SCK
0.5
+
f
SCK
1.5
+
f
SCK
or f
/2)
X
X
R/W
R/W
= 2.5-MHz Operation)
Note 2
Maximum
40.0 s + 1.5/f
µ
SCK
65.6 s + 1.5/f
µ
SCK
91.2 s + 1.5/f
µ
SCK
116.8 s + 1.5/f
µ
SCK
142.4 s + 1.5/f
µ
SCK
µ
168.0 s + 1.5/f
SCK
µ
193.6 s + 1.5/f
SCK
µ
219.2 s + 1.5/f
SCK
244.8 s + 1.5/f
µ
SCK
270.4 s + 1.5/f
µ
SCK
296.0 s + 1.5/f
µ
SCK
321.6 s + 1.5/f
µ
SCK
347.2 s + 1.5/f
µ
SCK
372.8 s + 1.5/f
µ
SCK
398.4 s + 1.5/f
µ
SCK
µ
424.0 s + 1.5/f
SCK
433
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