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414
CHAPTER 18 SERIAL INTERFACE CHANNEL 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
SCK, the minimum
interval time is 2/fSCK.
Minimum = (n+1) × + +
Maximum = (n+1) × + +
Cautions 1. Do not write data to ADTI during operation of automatic data transmit/receive
function.
2. Bits 5 and 6 must be set to zero.
3. To control the data transfer interval by means of automatic transmission/reception
with ADTI, busy control (refer to 18.4.3 (4) (a) Busy control option) is disabled.
Remarks 1. f
XX : Main system clock frequency (fX or fX/2)
2. fX : Main system clock oscillation frequency
3. f
SCK : Serial clock frequency
28
0.5
f
XX
fSCK
36
1.5
f
XX
fSCK
2
6
fXX
2
6
fXX
Data Transfer Interval Specification (fXX = 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/fSCK
62.4
s + 0.5/fSCK
88.0
s + 0.5/fSCK
113.6
s + 0.5/fSCK
139.2
s + 0.5/fSCK
164.8
s + 0.5/fSCK
190.4
s + 0.5/fSCK
216.0
s + 0.5/fSCK
241.6
s + 0.5/fSCK
267.2
s + 0.5/fSCK
292.8
s + 0.5/fSCK
318.4
s + 0.5/fSCK
344.0
s + 0.5/fSCK
369.6
s + 0.5/fSCK
395.2
s + 0.5/fSCK
420.8
s + 0.5/fSCK
Maximum
Note 2
40.0
s + 1.5/fSCK
65.6
s + 1.5/fSCK
91.2
s + 1.5/fSCK
116.8
s + 1.5/fSCK
142.4
s + 1.5/fSCK
168.0
s + 1.5/fSCK
193.6
s + 1.5/fSCK
219.2
s + 1.5/fSCK
244.8
s + 1.5/fSCK
270.4
s + 1.5/fSCK
296.0
s + 1.5/fSCK
321.6
s + 1.5/fSCK
347.2
s + 1.5/fSCK
372.8
s + 1.5/fSCK
398.4
s + 1.5/fSCK
424.0
s + 1.5/fSCK
65432107
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
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