S1C62740 TECHNICAL HARDWARE
EPSON
I-117
CHAPTER 5: SUMMARY OF NOTES
(2) Perform data writing/reading to data registers SD0–SD7 only
while the serial interface is halted (i.e., the synchronous clock is
neither being input or output).
(3) As a trigger condition, it is required that data writing or reading
on data registers SD0–SD7 be performed prior to writing "1" to
SCTRG. (The internal circuit of the serial interface is initiated
through data writing/reading on data registers SD0–SD7.)
Supply trigger only once every time the serial interface is placed
in the RUN state. Moreover, when the synchronous clock SCLK
is external clock, start to input the external clock after the
trigger.
A/D converter (1) To reduce current consumption, set the reference voltage
generation circuit, the middle electric potential generation
circuit and the A/D converter to OFF when it is not necessary.
(2) Do not fail to select the correct combinations for the analog
input terminal and measurement items. (Refer to Table 4.12.1)
(3) To perform a stable A/D conversion, secure the decided wait
time.
(4) Be sure to check whether the data is effective or invalid by
reading the A/D conversion data in the order F7H
→ F8H →
F9H
→ FAH and immediately thereafter reading the IDR (FBH).
(5) When reading data after turning the A/D converter OFF, the A/
D converter should be OFF in the period from an interrupt
generation to the beginning of a reverse integration.
(6) When the A/D converter is reset or turned OFF, the interrupt
factor flag (IAD) may sometimes be set to "1". Consequently,
read the flag (reset the flag) as necessary at reset or at the
turning OFF.
AMP circuit (1) To reduce current consumption, set the AMP circuit to OFF
when it is not necessary.
(2) After setting AMP circuit turns ON, wait at least 3 msec for the
operation of the AMP circuit to stabilize before using the output
of the AMP circuit.
SVD circuit (1) To obtain a stable SVD detection result, the SVD circuit must
be on for at least l00 sec. So, to obtain the SVD detection
result, follow the programming sequence below.
Set SVDON to "1"
Maintain for 100 sec minimum
Set SVDON to "0"
Read SVDDT