223
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) (4/4)
ADTI4 ADTI3 ADTI2 ADTI1 ADTI0
Specifies interval time of data transfer (f
XX
= 2.5 MHz)
Minimum value
Note
Maximum value
Note
1
0
0
0
0
446.4
μ
s + 0.5/f
SCK
449.6
μ
s + 1.5/f
SCK
1
0
0
0
1
472.0
μ
s + 0.5/f
SCK
475.2
μ
s + 1.5/f
SCK
1
0
0
1
0
497.6
μ
s + 0.5/f
SCK
500.8
μ
s + 1.5/f
SCK
1
0
0
1
1
523.2
μ
s + 0.5/f
SCK
526.4
μ
s + 1.5/f
SCK
1
0
1
0
0
548.8
μ
s + 0.5/f
SCK
552.0
μ
s + 1.5/f
SCK
1
0
1
0
1
574.4
μ
s + 0.5/f
SCK
577.6
μ
s + 1.5/f
SCK
1
0
1
1
0
600.0
μ
s + 0.5/f
SCK
603.2
μ
s + 1.5/f
SCK
1
0
1
1
1
625.6
μ
s + 0.5/f
SCK
628.8
μ
s + 1.5/f
SCK
1
1
0
0
0
651.2
μ
s + 0.5/f
SCK
654.4
μ
s + 1.5/f
SCK
1
1
0
0
1
676.8
μ
s + 0.5/f
SCK
680.0
μ
s + 1.5/f
SCK
1
1
0
1
0
702.4
μ
s + 0.5/f
SCK
705.6
μ
s + 1.5/f
SCK
1
1
0
1
1
728.0
μ
s + 0.5/f
SCK
731.2
μ
s + 1.5/f
SCK
1
1
1
0
0
753.6
μ
s + 0.5/f
SCK
756.8
μ
s + 1.5/f
SCK
1
1
1
0
1
779.2
μ
s + 0.5/f
SCK
782.4
μ
s + 1.5/f
SCK
1
1
1
1
0
804.8
μ
s + 0.5/f
SCK
808.0
μ
s + 1.5/f
SCK
1
1
1
1
1
830.4
μ
s + 0.5/f
SCK
833.6
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)
×
+ 28
Maximum value = (n+1)
×
f
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
f
XX
0.5
f
SCK
2
6
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