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CHAPTER 18 SERIAL INTERFACE CHANNEL 1
Data Transfer Interval Specification (fXX = 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/fSCK
472.0
s + 0.5/fSCK
497.6
s + 0.5/fSCK
523.2
s + 0.5/fSCK
548.8
s + 0.5/fSCK
574.4
s + 0.5/fSCK
600.0
s + 0.5/fSCK
625.6
s + 0.5/fSCK
651.2
s + 0.5/fSCK
676.8
s + 0.5/fSCK
702.4
s + 0.5/fSCK
728.0
s + 0.5/fSCK
753.6
s + 0.5/fSCK
779.2
s + 0.5/fSCK
804.8
s + 0.5/fSCK
830.4
s + 0.5/fSCK
Maximum
Note
449.6
s + 1.5/fSCK
475.2
s + 1.5/fSCK
500.8
s + 1.5/fSCK
526.4
s + 1.5/fSCK
552.0
s + 1.5/fSCK
577.6
s + 1.5/fSCK
603.2
s + 1.5/fSCK
628.8
s + 1.5/fSCK
654.4
s + 1.5/fSCK
680.0
s + 1.5/fSCK
705.6
s + 1.5/fSCK
731.2
s + 1.5/fSCK
756.8
s + 1.5/fSCK
782.4
s + 1.5/fSCK
808.0
s + 1.5/fSCK
833.6
s + 1.5/fSCK
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
Figure 18-5. Automatic Data Transmit/Receive Interval Specify Register Format (4/4)
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 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 (fX or fX/2)
2. fX : Main system clock oscillation frequency
3. fSCK : Serial clock frequency
2
6
28 0.5
f
XX fXX fSCK
2
6
36 1.5
f
XX fXX fSCK