Download III - Renesas Electronics

CHAPTER 8
APPLICATIONS OF SERIAL INTERFACE
Figure 8-16. Format of Automatic Data Transfer/Reception Interval Specification Register
(µPD78054, 78054Y, 78078, 78078Y, 780018, 780018Y, 780058, 780058Y, 78058F,
78058FY, 78075B, 78075BY subseries, µPD78070A, 78070AY) (2/4)
Symbol
7
ADTI ADTI7
6
5
0
0
4
3
1
2
0
ADTI4 ADTI3 ADTI2 ADTI1 ADTI0
ADTI4 ADTI3 ADTI2 ADTI1 ADTI0
Address
At reset
R/W
FF6BH
00H
R/W
Specifies interval time of data transfer (fXX = 5.0 MHz)
Minimum valueNote
Maximum valueNote
1
0
0
0
0
223.2 µs + 0.5/fSCK
224.8 µs + 1.5/fSCK
1
0
0
0
1
236.0 µs + 0.5/fSCK
237.6 µs + 1.5/fSCK
1
0
0
1
0
248.8 µs + 0.5/fSCK
250.4 µs + 1.5/fSCK
1
0
0
1
1
261.6 µs + 0.5/fSCK
263.2 µs + 1.5/fSCK
1
0
1
0
0
274.4 µs + 0.5/fSCK
276.0 µs + 1.5/fSCK
1
0
1
0
1
287.2 µs + 0.5/fSCK
288.8 µs + 1.5/fSCK
1
0
1
1
0
300.0 µs + 0.5/fSCK
301.6 µs + 1.5/fSCK
1
0
1
1
1
312.8 µs + 0.5/fSCK
314.4 µs + 1.5/fSCK
1
1
0
0
0
325.6 µs + 0.5/fSCK
327.2 µs + 1.5/fSCK
1
1
0
0
1
338.4 µs + 0.5/fSCK
340.0 µs + 1.5/fSCK
1
1
0
1
0
351.2 µs + 0.5/fSCK
352.8 µs + 1.5/fSCK
1
1
0
1
1
364.0 µs + 0.5/fSCK
365.6 µs + 1.5/fSCK
1
1
1
0
0
376.8 µs + 0.5/fSCK
378.4 µs + 1.5/fSCK
1
1
1
0
1
389.6 µs + 0.5/fSCK
391.2 µs + 1.5/fSCK
1
1
1
1
0
402.4 µs + 0.5/fSCK
404.0 µs + 1.5/fSCK
1
1
1
1
1
415.2 µs + 0.5/fSCK
416.8 µs + 1.5/fSCK
Note The interval time of data transfer includes an error margin. The minimum and maximum values of the interval
time for data transfer can be calculated by the following expressions (where n is the value set to ADTI0
through ADTI4). However, if the minimum value calculated by the expression below is less than 2/fSCK,
the minimum interval time is 2/fSCK.
Minimum value = (n+1) ×
Maximum value = (n+1) ×
26
fXX
26
fXX
+
+
28
fXX
36
fXX
+
0.5
fSCK
+
1.5
fSCK
Cautions 1. Do not write ADTI during automatic transfer/reception operation.
2. Be sure to clear bits 5 and 6 to 0.
3. When controlling interval time of data transfer by automatic transfer/reception using ADTI,
the busy control option is invalid.
Remarks 1. fXX : main system clock frequency (fX or fX/2)
2. fX
: main system clock oscillation frequency
3. fSCK : serial clock frequency
220