CHAPTER 13 A/D CONVERTER
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User’s Manual U14492EJ3V0UD
(6) A/D conversion result registers 0n, 1n (ADCR0n, ADCR1n)
ADCR0n and ADCR1n are 10-bit registers that hold A/D conversion results (n = 0 to 7). Whenever an A/D
conversion terminates, the conversion result from the successive approximation register (SAR) is loaded.
RESET input sets these registers to 0000H.
(7) Controller
The controller selects an analog input, generates sample and hold circuit operation timing, controls
conversion triggers, and specifies the conversion operation time according to the mode set in the ADSCMn0
or ADSCMn1 register (n = 0, 1).
(8) ANI0n, ANI1n pins (n = 0 to 7)
The ANI0n and ANI1n pins are the 8-channel (total of 16 channels for two circuits) analog input pins to A/D
converters 0 and 1. They input analog signals to be A/D converted.
Caution
Use input voltages to ANI0n and ANI1n that are within the range of the ratings. In
particular, if a voltage (including noise) higher than AV
DD
or lower than AV
SS
(even one
within the range of absolute maximum ratings) is input, the conversion value of that
channel is invalid, and the conversion values of other channels also may be affected.
(9) AV
REF0
, AV
REF1
pins
The AV
REF0
and AV
REF1
pins are used to input reference voltages to A/D converters 0 and 1. A signal input to
the ANI0n or ANI1n pin is converted to a digital signal based on the voltage applied between AV
REF0
and
AV
SS
or between AV
REF1
and AV
SS
(n = 0 to 7).
Caution
If not using the AV
REF0
or AV
REF1
pin, connect it to V
SS5
.
(10) AV
SS
pin
The AV
SS
pin is the ground voltage pin of A/D converters 0 and 1. Even if not using A/D converters 0 and 1,
always make this pin have the same potential as the V
SS5
pin.
(11) AV
DD
pin
The AV
DD
pin is the analog power supply pin of A/D converters 0 and 1. Even if not using A/D converters 0
and 1, always make this pin have the same potential as the V
DD5
pin.
Содержание V850E/IA1 mPD703116
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