NEC uPD78054Y User Manual
404
CHAPTER 18 SERIAL INTERFACE CHANNEL 1
Figure 18-5. Automatic Data Transmit/Receive Interval Specify Register Format (4/4)
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)
×
+
+
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 (f
X
or f
X
/2)
2. f
X
: Main system clock oscillation frequency
3. f
SCK
: Serial clock frequency
2
6
f
XX
2
6
f
XX
28
f
f
XX
36
f
f
XX
0.5
f
SCK
1.5
f
SCK
Data Transfer Interval Specification (f
XX
= 2.5 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
446.4
s + 0.5/f
SCK
472.0
s + 0.5/f
SCK
497.6
s + 0.5/f
SCK
523.2
s + 0.5/f
SCK
548.8
s + 0.5/f
SCK
574.4
s + 0.5/f
SCK
600.0
s + 0.5/f
SCK
625.6
s + 0.5/f
SCK
651.2
s + 0.5/f
SCK
676.8
s + 0.5/f
SCK
702.4
s + 0.5/f
SCK
728.0
s + 0.5/f
SCK
753.6
s + 0.5/f
SCK
779.2
s + 0.5/f
SCK
804.8
s + 0.5/f
SCK
830.4
s + 0.5/f
SCK
Maximum
Note
449.6
s + 1.5/f
SCK
475.2
s + 1.5/f
SCK
500.8
s + 1.5/f
SCK
526.4
s + 1.5/f
SCK
552.0
s + 1.5/f
SCK
577.6
s + 1.5/f
SCK
603.2
s + 1.5/f
SCK
628.8
s + 1.5/f
SCK
654.4
s + 1.5/f
SCK
680.0
s + 1.5/f
SCK
705.6
s + 1.5/f
SCK
731.2
s + 1.5/f
SCK
756.8
s + 1.5/f
SCK
782.4
s + 1.5/f
SCK
808.0
s + 1.5/f
SCK
833.6
s + 1.5/f
SCK
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
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