Automatic Data Transmit/Receive Interval Specify Register Format - NEC PD78052 User Manual

(4) Automatic data transmit/receive interval specify register (ADTI)
This register sets the automatic data transmit/receive function data transfer interval.
ADTI is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets ADTI to 00H.
Figure 18-5. Automatic Data Transmit/Receive Interval Specify Register Format (1/4)
Symbol
7 6 5
ADTI ADTI7 0 0 ADTI4 ADTI3 ADTI2 ADTI1 ADTI0
ADTI7 Data Transfer Interval Control
0 No control of interval by ADTI
1 Control of interval by ADTI (ADTI0 to ADTI4)
ADTI4 ADTI3 ADTI2 ADTI1
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 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/f
Minimum = (n+1)
Cautions 1. Do not write 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 : Main system clock frequency (f
XX
2. f : Main system clock oscillation frequency
X
3. f : Serial clock frequency
SCK
CHAPTER 18 SERIAL INTERFACE CHANNEL 1
4 3 2 1 0
Note 1
Data Transfer Interval Specification (f
ADTI0
Minimum
0 0 18.4 s + 0.5/f
0 1 31.2 s + 0.5/f
1 0 44.0 s + 0.5/f
1 1 56.8 s + 0.5/f
0 0 69.6 s + 0.5/f
0 1 82.4 s + 0.5/f
1 0 95.2 s + 0.5/f
1 1 108.0 s + 0.5/f
0 0 120.8 s + 0.5/f
0 1 133.6 s + 0.5/f
1 0 146.4 s + 0.5/f
1 1 159.2 s + 0.5/f
0 0 172.0 s + 0.5/f
0 1 184.8 s + 0.5/f
1 0 197.6 s + 0.5/f
1 1 210.4 s + 0.5/f
6
2
28 0.5
+ + , Maximum = (n+1)
f f
f
SCK
XX XX
X
Address After Reset R/W
FF6BH 00H R/W
= 5.0 MHz Operation)
XX
Note 2 Maximum
20.0
SCK
32.8 s + 1.5/f
SCK
45.6 s + 1.5/f
SCK
58.4 s + 1.5/f
SCK
71.2
SCK
84.0
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
, the minimum interval time is 2/f
SCK
6
2
+
f
XX
or f /2)
X
Note 2
s + 1.5/f
SCK
SCK
SCK
SCK
s + 1.5/f
SCK
s + 1.5/f
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
.
SCK
36 1.5
+
f f
XX SCK
401