Datasheet
78K0/Ix2 CHAPTER 11 A/D CONVERTER
R01UH0010EJ0500 Rev.5.00 367
Feb 28, 2012
(8) 8-bit A/D conversion result register L (ADCRL)
The A/D conversion result is loaded from the successive approximation register to this register each time A/D
conversion is completed, and the ADCRH register stores the lower 8 bits of the A/D conversion result.
(9) 8-bit A/D conversion result register H (ADCRH)
The A/D conversion result is loaded from the successive approximation register to this register each time A/D
conversion is completed, and the ADCRH register stores the higher 8 bits of the A/D conversion result.
(10) 10-bit A/D conversion result register for TMXn synchronization (ADCRXn = 0, 1)
If A/D conversion is started with the output of 16-bit timer Xn as the trigger, the conversion result is loaded from the
successive approximation register and the A/D conversion result is held in the lower 10 bits (the higher 6 bits are fixed
to 0) every time an A/D conversion ends.
(11) 8-bit A/D conversion result register L for TMXn synchronization (ADCRXnL = 0, 1)
If A/D conversion is started with the output of 16-bit timer Xn as the trigger, the conversion result is loaded from the
successive approximation register and the lower 8 bits of the A/D conversion result are held in ADCRXnL register,
every time an A/D conversion ends.
Caution When data is read from ADCR, ADCRL, ADCRH, ADCRX0, ADCRX1, ADCRX0L, and ADCRX1L, a
wait cycle is generated. Do not read data from ADCR, ADCRL, ADCRH, ADCRX0, ADCRX1,
ADCRX0L, and ADCRX1L when the peripheral hardware clock (f
PRS) is stopped. For details, refer to
CHAPTER 31 CAUTIONS FOR WAIT.
(12) Controller
This circuit controls the conversion time of an input analog signal that is to be converted into a digital signal, as well
as starting and stopping of the conversion operation. When all the specified A/D conversion has been completed, this
controller generates an A/D conversion end interrupt request signal (INTAD).
(13) AV
REF pin
This pin inputs an analog power/reference voltage to the A/D converter. Make this pin the same potential as the VDD
pin when ports 2 and 7 are used as a digital port.
The signal input to ANI0 to ANI8 is converted into a digital signal, based on the voltage applied across AV
REF and
AV
SS.
(14) AV
SS pin (78K0/IB2 only)
This is the ground potential pin of the A/D converter. Always use this pin at the same potential as that of the V
SS pin
even when the A/D converter is not used.
(15) VSS pin
This is the ground potential pin. In the 78K0/IY2 and 78K0/IA, VSS functions alternately as the ground potential of the
A/D converter. Be sure to connect VSS to a stabilized GND (= 0 V).