NEC uPD78P078 - Manual (Page 422)

422
CHAPTER 19 SERIAL INTERFACE CHANNEL 1
Figure 19-5. Automatic Data Transmit/Receive Interval Specify Register Format (2/4)
Note 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
SCK
, the minimum interval time
is 2/f SCK .
Minimum = (n + 1)
×
+ +
Maximum = (n + 1)
×
+ +
Cautions 1. Do not write to ADTI during operation of the automatic data transmit/receive function.
2. Bits 5 and 6 must be set to 0.
3. When controlling the data transfer interval by automatic transmit/receive using
ADTI, busy control (refer to 19.4.3 (4) (a) Busy control option) becomes invalid.
Remark f XX : Main system clock frequency (f X or f X /2)
f X : Main system clock oscillation frequency
f SCK : Serial clock frequency
2 6 28 0.5
f
XX
f
XX
f
SCK
2 6 36 1.5
f
XX
f
XX
f
SCK
Data Transfer Interval Specification (f XX = 5.0-MHz Operation)
ADTI4 ADTI3 ADTI2 ADTI1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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
223.2 s + 0.5/f SCK
236.0 s + 0.5/f SCK
248.8 s + 0.5/f SCK
261.6 s + 0.5/f
SCK
274.4 s + 0.5/f
SCK
287.2 s + 0.5/f
SCK
300.0 s + 0.5/f
SCK
312.8 s + 0.5/f SCK
325.6 s + 0.5/f SCK
338.4 s + 0.5/f SCK
351.2 s + 0.5/f SCK
364.0 s + 0.5/f SCK
376.8 s + 0.5/f SCK
389.6 s + 0.5/f
SCK
402.4 s + 0.5/f
SCK
415.2 s + 0.5/f
SCK
Maximum Note
224.8 s + 1.5/f SCK
237.6 s + 1.5/f SCK
250.4 s + 1.5/f SCK
263.2 s + 1.5/f
SCK
276.0 s + 1.5/f
SCK
288.8 s + 1.5/f
SCK
301.6 s + 1.5/f
SCK
314.4 s + 1.5/f SCK
327.2 s + 1.5/f SCK
340.0 s + 1.5/f SCK
352.8 s + 1.5/f SCK
365.6 s + 1.5/f SCK
378.4 s + 1.5/f SCK
391.2 s + 1.5/f
SCK
404.0 s + 1.5/f
SCK
416.8 s + 1.5/f
SCK
6 5 4 3 2 1 0 7
Symbol
ADTI ADTI7 0 0 ADTI4 ADTI3 ADTI2 ADTI1 ADTI0 FF6BH 00H R/W
Address After Reset R/W
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