NEC mPD780208 Subseries User Manual page 266

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 the
minimum calculated by the following expression is smaller than 2/f
is 2/f .
SCK
Minimum = (n + 1) ×
Maximum = (n + 1) ×
Cautions 1. ADTI should not be written to during operation of the automatic transmit/receive
function.
2. Bits 5 and 6 must be set to 0.
3. When ADTI is used to control the interval time of data transfer by automatic transmit/
receive function, busy control (refer to 14.4.3 (4) (a) Busy control option) is invalid.
Remarks 1. f :
X
2. f : Serial clock frequency
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266
CHAPTER 14 SERIAL INTERFACE CHANNEL 1
7
2 56
+
f
X
2 7 72
+
f
X
Main system clock oscillation frequency
User's Manual U11302EJ4V0UM
0.5
+
f f
X SCK
1.5
+
f f
X SCK
, the minimum interval time
SCK