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CHAPTER 19 SERIAL INTERFACE CHANNEL 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/fSCK.
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 (fX or fX/2)
fX : Main system clock oscillation frequency
fSCK : Serial clock frequency
fXX fXX fSCK
2
6
28 0.5
f
XX fXX fSCK
2
6
36 1.5
Figure 19-5. Automatic Data Transmit/Receive Interval Specify Register Format (4/4)
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
472.0 s + 0.5/f
SCK
497.6 s + 0.5/f
SCK
523.2 s + 0.5/f
SCK
548.8 s + 0.5/f
SCK
574.4 s + 0.5/f
SCK
600.0 s + 0.5/f
SCK
625.6 s + 0.5/f
SCK
651.2 s + 0.5/f
SCK
676.8 s + 0.5/f
SCK
702.4 s + 0.5/f
SCK
728.0 s + 0.5/f
SCK
753.6 s + 0.5/f
SCK
779.2 s + 0.5/f
SCK
804.8 s + 0.5/f
SCK
830.4 s + 0.5/f
SCK
Maximum
Note
449.6 s + 1.5/f
SCK
475.2 s + 1.5/f
SCK
500.8 s + 1.5/f
SCK
526.4 s + 1.5/f
SCK
552.0 s + 1.5/f
SCK
577.6 s + 1.5/f
SCK
603.2 s + 1.5/f
SCK
628.8 s + 1.5/f
SCK
654.4 s + 1.5/f
SCK
680.0 s + 1.5/f
SCK
705.6 s + 1.5/f
SCK
731.2 s + 1.5/f
SCK
756.8 s + 1.5/f
SCK
782.4 s + 1.5/f
SCK
808.0 s + 1.5/f
SCK
833.6 s + 1.5/f
SCK
65432107
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
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ