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(c) Automatic data transmit/receive interval specification register (ADTI0)
This register sets the automatic data transmit/receive function data transfer interval.
ADTI0 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets ADTI to 00H.
Address: FF6BH After reset: 00H
Symbol
7
6
5
ADTI0
ADTI07
0
0
ADTI07
0
No control of interval by ADTI0
1
Control of interval by ADTI0 (ADTI00 to ADTI04)
ADTI04 ADTI03 ADTI02 ADTI01
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
1
0
1
0
0
1
0
0
1
0
0
1
0
0
1
1
0
1
1
0
1
1
0
1
1
Notes 1. The interval time is 2/f
2. The data transfer interval time is calculated from the following expressions (n: Value set to
ADTI00 to ADTI04).
<1> n = 0
<2> n = 1 to 31
Cautions
1. Do not write ADTI0 during operation of automatic data transmit/receive function.
2. Be sure to set bits 5 and 6 to 0.
3. When controlling the interval time of automatic transmit/receive data transfer by
Remark f
:
X
f
: Serial clock frequency
SCK
228
CHAPTER 14 SERIAL INTERFACE (SIO1)
R/W
4
3
2
1
ADTI04 ADTI03 ADTI02 ADTI01 ADTI00
Data transfer interval control
Note 1
Data transfer interval specification (f
ADTI00
µ
0
0
1.90
s + 0.5/f
0
1
µ
1
0
2.86
s + 0.5/f
µ
1
1
3.81
s + 0.5/f
µ
4.76
s + 0.5/f
0
0
µ
0
1
5.71
s + 0.5/f
µ
6.67
s + 0.5/f
1
0
µ
1
1
7.62
s + 0.5/f
µ
8.57
s + 0.5/f
0
0
µ
0
1
9.52
s + 0.5/f
µ
10.5
s + 0.5/f
1
0
µ
1
1
11.4
s + 0.5/f
µ
0
0
12.4
s + 0.5/f
µ
13.3
s + 0.5/f
0
1
µ
1
0
14.3
s + 0.5/f
µ
15.2
s + 0.5/f
1
1
.
SCK
2
0.5
Interval time =
+
f
f
SCK
n+1
0.5
Interval time =
+
f
f
SCK
using ADTI0, busy control is invalid. (Refer to 14.4.3 (4) (a) Busy control option.)
Main system clock oscillation frequency
Preliminary User's Manual U13420EJ2V0UM00
0
= 8.38 MHz, f
X
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
= 1.05 MHz)
Note 2
SCK
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