NEC - page 413

413
CHAPTER 18 SERIAL INTERFACE CHANNEL 1
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/fSCK, the minimum interval time
is 2/fSCK.
Minimum = (n+1) × + +
Maximum = (n+1) × + +
Cautions 1. Do not write data to 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. fXX : Main system clock frequency (fX or fX/2)
2. fX: Main system clock oscillation frequency
3. fSCK : Serial clock frequency
26
fXX
26
fXX
28 0.5
fXX fSCK
36 1.5
fXX fSCK
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
65432107
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