409
CHAPTER 18 SERIAL INTERFACE CHANNEL 1
Data Transfer Interval Specification (f
XX
= 2.5 MHz Operation)
ADTI4 ADTI3 ADTI2 ADTI1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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
446.4
s + 0.5/f
SCK
μ
472.0
s + 0.5/f
SCK
μ
497.6
s + 0.5/f
SCK
μ
523.2
s + 0.5/f
SCK
μ
548.8
s + 0.5/f
SCK
μ
574.4
s + 0.5/f
SCK
μ
600.0
s + 0.5/f
SCK
μ
625.6
s + 0.5/f
SCK
μ
651.2
s + 0.5/f
SCK
μ
676.8
s + 0.5/f
SCK
μ
702.4
s + 0.5/f
SCK
μ
728.0
s + 0.5/f
SCK
μ
753.6
s + 0.5/f
SCK
μ
779.2
s + 0.5/f
SCK
μ
804.8
s + 0.5/f
SCK
μ
830.4
s + 0.5/f
SCK
μ
Maximum
Note
449.6
s + 1.5/f
SCK
μ
475.2
s + 1.5/f
SCK
μ
500.8
s + 1.5/f
SCK
μ
526.4
s + 1.5/f
SCK
μ
552.0
s + 1.5/f
SCK
μ
577.6
s + 1.5/f
SCK
μ
603.2
s + 1.5/f
SCK
μ
628.8
s + 1.5/f
SCK
μ
654.4
s + 1.5/f
SCK
μ
680.0
s + 1.5/f
SCK
μ
705.6
s + 1.5/f
SCK
μ
731.2
s + 1.5/f
SCK
μ
756.8
s + 1.5/f
SCK
μ
782.4
s + 1.5/f
SCK
μ
808.0
s + 1.5/f
SCK
μ
833.6
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
ADTI0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
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 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 ADTI during operation of automatic data transmit/receive function.
2. Bits 5 and 6 must be set to zero.
3. If the auto send and receive data transmission interval time is controlled using ADTI,
busy control becomes invalid (see 18.4.3 (4) (a) Busy control option).
Remarks 1.
f
XX
:
:
:
Main system clock frequency (f
X
or f
X
/2)
Main system clock oscillation frequency
Serial clock frequency
2.
f
X
3.
f
SCK
2
6
f
XX
2
6
f
XX
28
f
XX
0.5
f
SCK
36
f
XX
1.5
f
SCK