220
CHAPTER 8 APPLICATIONS OF SERIAL INTERFACE
Figure 8-16. Format of Automatic Data Transfer/Reception Interval Specification Register
(
μ
PD78054, 78054Y, 78078, 78078Y, 780018, 780018Y, 780058, 780058Y, 78058F,
78058FY, 78075B, 78075BY subseries,
μ
PD78070A, 78070AY) (2/4)
ADTI4 ADTI3 ADTI2 ADTI1 ADTI0
Specifies interval time of data transfer (f
XX
= 5.0 MHz)
Minimum value
Note
Maximum value
Note
1
0
0
0
0
223.2
μ
s + 0.5/f
SCK
224.8
μ
s + 1.5/f
SCK
1
0
0
0
1
236.0
μ
s + 0.5/f
SCK
237.6
μ
s + 1.5/f
SCK
1
0
0
1
0
248.8
μ
s + 0.5/f
SCK
250.4
μ
s + 1.5/f
SCK
1
0
0
1
1
261.6
μ
s + 0.5/f
SCK
263.2
μ
s + 1.5/f
SCK
1
0
1
0
0
274.4
μ
s + 0.5/f
SCK
276.0
μ
s + 1.5/f
SCK
1
0
1
0
1
287.2
μ
s + 0.5/f
SCK
288.8
μ
s + 1.5/f
SCK
1
0
1
1
0
300.0
μ
s + 0.5/f
SCK
301.6
μ
s + 1.5/f
SCK
1
0
1
1
1
312.8
μ
s + 0.5/f
SCK
314.4
μ
s + 1.5/f
SCK
1
1
0
0
0
325.6
μ
s + 0.5/f
SCK
327.2
μ
s + 1.5/f
SCK
1
1
0
0
1
338.4
μ
s + 0.5/f
SCK
340.0
μ
s + 1.5/f
SCK
1
1
0
1
0
351.2
μ
s + 0.5/f
SCK
352.8
μ
s + 1.5/f
SCK
1
1
0
1
1
364.0
μ
s + 0.5/f
SCK
365.6
μ
s + 1.5/f
SCK
1
1
1
0
0
376.8
μ
s + 0.5/f
SCK
378.4
μ
s + 1.5/f
SCK
1
1
1
0
1
389.6
μ
s + 0.5/f
SCK
391.2
μ
s + 1.5/f
SCK
1
1
1
1
0
402.4
μ
s + 0.5/f
SCK
404.0
μ
s + 1.5/f
SCK
1
1
1
1
1
415.2
μ
s + 0.5/f
SCK
416.8
μ
s + 1.5/f
SCK
Note
The interval time of data transfer includes an error margin. The minimum and maximum values of the interval
time for data transfer can be calculated by the following expressions (where n is the value set to ADTI0
through ADTI4). However, if the minimum value calculated by the expression below is less than 2/f
SCK
,
the minimum interval time is 2/f
SCK
.
Minimum value = (n+1)
×
+
+
Maximum value = (n+1)
×
+
+
Cautions 1. Do not write ADTI during automatic transfer/reception operation.
2. Be sure to clear bits 5 and 6 to 0.
3. When controlling interval time of data transfer by automatic transfer/reception using ADTI,
the busy control option is invalid.
Remarks 1.
f
XX
: main system clock frequency (f
X
or f
X
/2)
2.
f
X
: main system clock oscillation frequency
3.
f
SCK
: serial clock frequency
2
6
f
XX
28
f
XX
0.5
f
SCK
2
6
f
XX
36
f
XX
1.5
f
SCK
7
6
5
4
3
2
Symbol
1
0
FF6BH
ADTI0
ADTI
ADTI1
ADTI3 ADTI2
ADTI4
0
0
ADTI7
Address
At reset
R/W
00H
R/W