NEC PD789488 User Manual page 223

Figure 12-4. Format of Automatic Data Transmit/Receive Interval Specification Register 0 (2/2)
Symbol <7> 6
ADTI0 ADTI07 0
ADTI04 ADTI03
1 0
1 0
1 0
1 0
1 0
1 0
1 0
1 0
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
Notes 1. The interval time depends only on the CPU processing.
2. The data transfer interval time is found from the following expressions (n: Value set to ADTI00 to
ADTI04).
<1> n = 0
Interval time =
<2> n = 1 to 31
Interval time =
Cautions 1. Do not write to ADTI0 during operation of the automatic transmit/receive function.
2. Be sure to set bits 5 and 6 to 0.
Remark f : Main system clock oscillation frequency
X
f : Serial clock frequency
SCK
CHAPTER 12 SERIAL INTERFACE 1A0
5 <4> <3>
0 ADTI04 ADTI03
ADTI02 ADTI01 ADTI00
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
2
0.5
+
f
f
SCK
SCK
n+1
0.5
+
f
f
SCK
SCK
User's Manual U15331EJ4V1UD
<2> <1> <0>
ADTI02 ADTI01 ADTI00
Data transfer interval specification
(f = 5.0 MHz, f
X SCK
µ s + 0.5/f
13.6
µ
s + 0.5/f
14.4
µ
s + 0.5/f
15.2
µ
s + 0.5/f
16.0
µ
s + 0.5/f
16.8
µ
s + 0.5/f
17.6
µ
s + 0.5/f
18.4
µ
19.2 s + 0.5/f
µ
20.0 s + 0.5/f
µ
20.8 s + 0.5/f
µ
21.6 s + 0.5/f
µ
22.4 s + 0.5/f
µ
23.2 s + 0.5/f
µ
24.0 s + 0.5/f
µ s + 0.5/f
24.8
µ s + 0.5/f
25.6
Address After reset R/W
FF7BH 00H R/W
Note 2
= 1.25 MHz)
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
S
CK
SCK
SCK
SCK
SCK
SCK
SCK
n
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
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