NEC 2. Zero must be set in bits 5 and 6., 28 0.5 fXX fSCK

406
CHAPTER 18 SERIAL INTERFACE CHANNEL 1
(c) Automatic data transmit/receive interval specify register (ADTI)
This register sets the automatic data transmit/receive function data transfer interval.
ADTI is set with a 1-bit or 8-bit memory manipulation instruction. RESET input sets ADTI to 00H.
Notes 1. The interval is dependent only on CPU processing.
2. 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/
fSCK, the minimum interval time is 2/fSCK.
Minimum = (n+1) ×+ + , Maximum = (n+1) ×++
Cautions 1. Do not write ADTI during operation of automatic data transmit/receive function.
2. Zero must be set in bits 5 and 6.
3. If the auto send and receive data transmission interval time is controlled using ADTI,
busy control becomes invalid (see 18.4.3 (4) (a) Busy control option).
Remarks 1. fXX : Main system clock frequency (fX or fX/2)
2. fX: Main system clock oscillation frequency
3. fSCK : Serial clock frequency
fXX
26
fXX fSCK
28 0.5 fXX fSCK
36 1.5
fXX
26
Data Transfer Interval Specification (f XX = 5.0 MHz Operation)
ADTI4 ADTI3 ADTI2 ADTI1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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 2
18.4 s + 0.5/f SCK
31.2 s + 0.5/f SCK
44.0 s + 0.5/f SCK
56.8 s + 0.5/f SCK
69.6 s + 0.5/f SCK
82.4 s + 0.5/f SCK
95.2 s + 0.5/f SCK
108.0 s + 0.5/f SCK
120.8 s + 0.5/f SCK
133.6 s + 0.5/f SCK
146.4 s + 0.5/f SCK
159.2 s + 0.5/f SCK
172.0 s + 0.5/f SCK
184.8 s + 0.5/f SCK
197.6 s + 0.5/f SCK
210.4 s + 0.5/f SCK
Maximum
Note 2
20.0 s + 1.5/f SCK
32.8 s + 1.5/f SCK
45.6 s + 1.5/f SCK
58.4 s + 1.5/f SCK
71.2 s + 1.5/f SCK
84.0 s + 1.5/f SCK
96.8 s + 1.5/f SCK
109.6 s + 1.5/f SCK
122.4 s + 1.5/f SCK
135.2 s + 1.5/f SCK
148.0 s + 1.5/f SCK
160.8 s + 1.5/f SCK
173.6 s + 1.5/f SCK
186.4 s + 1.5/f SCK
199.2 s + 1.5/f SCK
212.0 s + 1.5/f SCK
65432107
Symbol
ADTI ADTI7 0 0 ADTI4ADTI3 ADTI2 ADTI1 ADTI0 FF6BH 00H R/W
Address After Reset R/W
ADTI7
0
Data Transfer Interval Control
No control of interval by ADTI
Note 1
Control of interval by ADTI (ADTI0 to ADTI4)
1
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