140
78K/0 SERIES APPLICATION NOTE
Figure 8-9. Format of the Automatic Data Transmit/Receive Interval Setting Register
(Only for the
μ
PD78044F and
μ
PD780208 Subseries) (2/2)
ADTI4 ADTI3 ADTI2 ADTI1 ADTI0
Setting the interval time for data transfer (during f
X
= 5.0 MHz operation)
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
Errors are contained in the interval time for data transfer. The minimum and maximum values
of the interval time for each data transfer are determined from the following equations (n:
values set in ADTI0 to ADTI4). However, when the minimum value calculated from the
following equation is less than 2/f
SCK
, the minimum value of the interval time becomes 2/f
SCK
.
minimum value = (n + 1) x
2
7
f
X
+
56
f
X
+
0.5
f
SCK
maximum value = (n + 1) x
2
7
f
X
+
72
f
X
+
1.5
f
SCK
Cautions 1. Do not write to ADTI during operation of the automatic transmit/receive func-
tion.
2. Always set bits 5 and 6 to 0.
3. When ADTI is being used to control the interval time for data transfer performed
using the automatic transmission/reception function, busy control is disabled.
Remarks 1.
f
X
: Main system clock oscillation frequency
2.
f
SCK
: Serial clock frequency
7
ADTI7
6
0
5
0
4
ADTI4
3
ADTI3
2
ADTI2
1
ADTI1
0
ADTI0
Symbol
ADTI
Address
FF6BH
At reset
00H
R/W
R/W
*