388
CHAPTER 18 SERIAL INTERFACE CHANNEL 1
Figure 18-5. Automatic Data Transmit/Receive Interval Specify Register Format (2/4)
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/f
SCK
.
Minimum = (n + 1)
×
2
+
Maximum = (n + 1)
×
+
+
Cautions 1. Do not write ADTI during operation of automatic data transmit/receive function.
2. Zero must be set in bits 5 and 6.
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 invalid.
Remarks 1.
f
XX
: Main system clock frequency (f
X
or f
X
/2)
: Main system clock oscillation frequency
3.
f
SCK
: Serial clock frequency
2.
f
X
6
f
XX
28
f
XX
0.5
f
SCK
2
6
f
XX
36
f
XX
1.5
f
SCK
Data Transfer Interval Specification (f
XX
= 5.0 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
223.2
s + 0.5/f
SCK
μ
236.0
s + 0.5/f
SCK
μ
248.8
s + 0.5/f
SCK
μ
261.6
s + 0.5/f
SCK
μ
274.4
s + 0.5/f
SCK
μ
287.2
s + 0.5/f
SCK
μ
300.0
s + 0.5/f
SCK
μ
312.8
s + 0.5/f
SCK
μ
325.6
s + 0.5/f
SCK
μ
338.4
s + 0.5/f
SCK
μ
351.2
s + 0.5/f
SCK
μ
364.0
s + 0.5/f
SCK
μ
376.8
s + 0.5/f
SCK
μ
389.6
s + 0.5/f
SCK
μ
402.4
s + 0.5/f
SCK
μ
415.2
s + 0.5/f
SCK
μ
Maximum
Note
224.8
s + 1.5/f
SCK
μ
237.6
s + 1.5/f
SCK
μ
250.4
s + 1.5/f
SCK
μ
263.2
s + 1.5/f
SCK
μ
276.0
s + 1.5/f
SCK
μ
288.8
s + 1.5/f
SCK
μ
301.6
s + 1.5/f
SCK
μ
314.4
s + 1.5/f
SCK
μ
327.2
s + 1.5/f
SCK
μ
340.0
s + 1.5/f
SCK
μ
352.8
s + 1.5/f
SCK
μ
365.6
s + 1.5/f
SCK
μ
378.4
s + 1.5/f
SCK
μ
391.2
s + 1.5/f
SCK
μ
404.0
s + 1.5/f
SCK
μ
416.8
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