NEC PD78052 User Manual page 412

(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.
Symbol
7 6 5
ADTI ADTI7 0 0
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
interval time is 2/f
Minimum = (n+1)
Cautions 1. Do not write data to ADTI during operation of automatic data transmit/receive
function.
2. Zero must be set in bits 5 and 6.
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
2. f
X
3. f
SCK
412
CHAPTER 18 SERIAL INTERFACE CHANNEL 1
4 3 2 1 0
ADTI4 ADTI3 ADTI2 ADTI1 ADTI0
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
.
SCK
6
2 28
+
f f
XX XX
: Main system clock frequency (f
: Main system clock oscillation frequency
: Serial clock frequency
Address After Reset R/W
FF6BH 00H R/W
= 5.0 MHz Operation)
XX
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
0.5
+ , Maximum = (n+1)
f
SCK
or f /2)
X X
Maximum Note 2
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
SCK
, the minimum
SCK
26 36 1.5
+ +
f f
f
XX SCK
XX