NEC 78K0S/KA1+ Preliminary User's Manual page 156

www.DataSheet4U.com
(6) 10-bit A/D conversion result register (ADCR)
The result of A/D conversion is loaded from the successive approximation register to this register each time A/D
conversion is completed, and the ADCR register holds the result of A/D conversion in its lower 10 bits (the higher
6 bits are fixed to 0).
(7) 8-bit A/D conversion result register (ADCRH)
The result of A/D conversion is loaded from the successive approximation register to this register each time A/D
conversion is completed, and the ADCRH register holds the result of A/D conversion in its higher 8 bits.
(8) Controller
When A/D conversion has been completed, INTAD is generated.
www.DataSheet4U.com
(9) AV pin
REF
This pin inputs an analog power/reference voltage to the A/D converter. When the A/D converter is not used,
connect this pin to V
The signal input to ANI0 to ANI3 is converted into a digital signal, based on the voltage applied across AV
V .
SS
In the standby mode, the current flowing through the series resistor string can be reduced by lowering the voltage
input to the AV
(10) V pin
SS
This is the ground potential pin.
Caution In the 78K0S/KA1+, V
(11) A/D converter mode register (ADM)
This register is used to set the conversion time of the analog input signal to be converted, and to start or stop the
conversion operation.
(12) Analog input channel specification register (ADS)
This register is used to specify the port that inputs the analog voltage to be converted into a digital signal.
(13) Port mode control register 2 (PMC2)
This register is used when the P20/ANI0 to P23/ANI3 pins are used as the analog input pins of the A/D converter.
156
CHAPTER 10 A/D CONVERTER
.
DD
pin to the V level.
REF SS
and AV
SS
GND, and stabilize V via GND (= 0 V).
SS
Preliminary User's Manual U16898EJ1V0UD
are internally connected. Be sure to connect V
SS
and
REF
to a stable
SS