423
CHAPTER 19 SERIAL INTERFACE CHANNEL 1
Figure 19-5. Automatic Data Transmit/Receive Interval Specify Register Format (3/4)
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
SCK
, 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
XX
: Main system clock frequency (f
X
or f
X
/2)
f
X
: Main system clock oscillation frequency
f
SCK
: Serial clock frequency
2
6
f
XX
28
f
XX
2
6
f
XX
36
f
XX
0.5
f
SCK
1.5
f
SCK
Data Transfer Interval Specification (f
XX
= 2.5-MHz Operation)
ADTI4 ADTI3 ADTI2 ADTI1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Minimum
Note 2
36.8 s + 0.5/f
SCK
μ
62.4μ
SCK
88.0μ
SCK
113.6 s + 0.5/f
SCK
μ
139.2 s + 0.5/f
SCK
μ
164.8 s + 0.5/f
SCK
μ
190.4 s + 0.5/f
SCK
μ
216.0 s + 0.5/f
SCK
μ
241.6 s + 0.5/f
SCK
μ
267.2 s + 0.5/f
SCK
μ
292.8 s + 0.5/f
SCK
μ
318.4 s + 0.5/f
SCK
μ
344.0 s + 0.5/f
SCK
μ
369.6 s + 0.5/f
SCK
μ
395.2 s + 0.5/f
SCK
μ
420.8 s + 0.5/f
SCK
μ
Maximum
Note 2
40.0 s + 1.5/f
SCK
μ
65.6μ
SCK
91.2μ
SCK
116.8 s + 1.5/f
SCK
μ
142.4 s + 1.5/f
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
μ
244.8 s + 1.5/f
SCK
μ
270.4 s + 1.5/f
SCK
μ
296.0 s + 1.5/f
SCK
μ
321.6 s + 1.5/f
SCK
μ
347.2 s + 1.5/f
SCK
μ
372.8 s + 1.5/f
SCK
μ
398.4 s + 1.5/f
SCK
μ
424.0 s + 1.5/f
SCK
μ
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
ADTI7
0
Data Transfer Interval Control
No control of interval by ADTI
Note 1
Control of interval by ADTI (ADTI0 to ADTI4)
1
ADTI0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1