Datasheet

V850ES/JG3 APPENDIX E LIST OF CAUTIONS
R01UH0015EJ0300 Rev.3.00 Page 847 of 870
Sep 30, 2010
(14/36)
Chapter
Classification
Function Details of
Function
Cautions Page
Hard
ANI0 to ANI11
pins
Make sure that the voltages input to the ANI0 to ANI11 pins do not exceed the
rated values.
In particular if a voltage of AV
REF0 or higher is input to a channel, the conversion
value of that channel becomes undefined, and the conversion values of the other
channels may also be affected.
p. 409
Accessing the ADA0M0 register is prohibited in the following statuses. For details,
see 3.4.8 (2) Accessing specific on-chip peripheral I/O registers.
• When the CPU operates with the subclock and the main clock oscillation is
stopped
• When the CPU operates with the internal oscillation clock
p. 411
A write operation to bit 0 is ignored. p. 411
Changing the ADA0M1.ADA0FR2 to ADA0M1.ADA0FR0 bits is prohibited while
A/D conversion is enabled (ADA0CE bit = 1).
p. 411
When writing data to the ADA0M0, ADA0M2, ADA0S, ADA0PFM, or ADA0PFT
register in the following modes, stop the A/D conversion by clearing the ADA0CE
bit to 0. After the data is written to the register, enable the A/D conversion again
by setting the ADA0CE bit to 1.
• Normal conversion mode
• One-shot select mode/one-shot scan mode in high-speed conversion mode
If the ADA0M0, ADA0M2, ADA0S, ADA0PFM, and ADA0PFT registers are written
in the other modes during A/D conversion (ADA0EF bit = 1), the following will be
performed according to the mode.
• In software trigger mode
A/D conversion is stopped and started again from the beginning.
• In hardware trigger mode
A/D conversion is stopped, and the trigger standby status is set.
p. 411
To select the external trigger mode/timer trigger mode (ADA0TMD bit = 1), set the
highspeed conversion mode (ADA0M1.ADA0HS1 bit = 1). Do not input a trigger
during stabilization time that is inserted once after the A/D conversion operation is
enabled (ADA0CE bit = 1).
p. 411
ADA0M0
register
When not using the A/D converter, stop the operation by setting the ADA0CE bit
to 0 to reduce the power consumption.
p. 411
Changing the ADA0M1 register is prohibited while A/D conversion is enabled
(ADA0M0.ADA0CE bit = 1).
p. 412
To select the external trigger mode/timer trigger mode (ADA0M0.ADA0TMD bit =
1), set the high-speed conversion mode (ADA0HS1 bit = 1). Do not input a trigger
during stabilization time that is inserted once after the A/D conversion operation is
enabled (ADA0CE bit = 1).
p. 412
ADA0M1
register
Be sure to clear bits 6 to 4 to “0”. p. 412
Set as 2.6 μ s ≤ conversion time ≤ 10.4 μ s. p. 413
Chapter 13
Soft
A/D
converter
Conversion time
selection in
normal
conversion
mode
(ADA0HS1 bit =
0)
During A/D conversion, if the ADA0M0, ADA0M2, ADA0S, ADA0PFM, and
ADA0PFT registers are written or trigger is input, reconversion is carried out.
However, if the stabilization time end timing conflicts with the writing to these
registers, or if the stabilization time end timing conflicts with the trigger input, the
stabilization time of 64 clocks is reinserted.
If a conflict occurs again with the reinserted stabilization time end timing, the
stabilization time is reinserted. Therefore do not set the trigger input interval and
control register write interval to 64 clocks or below.
p. 413