upd78f9211grt2-jjg-a ETC-unknow, upd78f9211grt2-jjg-a Datasheet - Page 149

• Manufacturer Part Number: upd78f9211grt2-jjg-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: ETC-unknow

9.2
(1) ANI0 to ANI3 pins
(2) Sample & hold circuit
(3) D/A converter
(4) Voltage comparator
ANI1/P21/TI010/
ANI0/P20/TI000
Figure 9-2 shows the block diagram of A/D converter.
ANI2/X2/P22
ANI3/X1/P23
Cautions 1. In the 78K0S/KY1+, V
The A/D converter consists of the following hardware.
TO00/INTP0
Analog input
channel specification
register (ADS)
These are the analog input pins of the 4-channel A/D converter. They input analog signals to be converted into
digital signals. Pins other than the one selected as the analog input pin by the analog input channel specification
register (ADS) can be used as input port pins.
The sample & hold circuit samples the input signal of the analog input pin selected by the selector when A/D
conversion is started, and holds the sampled analog input voltage value during A/D conversion.
The D/A converter is connected between V
input signal.
The voltage comparator compares the sampled analog input voltage and the output voltage of the D/A converter.
Configuration of A/D Converter
TOH1
2. In the 78K0S/KY1+, V
ADS1
sure to connect V
When using the A/D converter, stabilize V
2
ADS0
ADCS
Figure 9-2. Block Diagram of A/D Converter
SS
Sample & hold circuit
FR2
to a stabilized GND (= 0 V).
SS
DD
Internal bus
functions alternately as the ground potential of the A/D converter. Be
CHAPTER 9 A/D CONVERTER
functions alternately as the A/D converter reference voltage input.
FR1
User’s Manual U16994EJ3V0UD
V
3
SS
DD
A/D converter mode
register (ADM)
FR0
and V
ADCE
SS
Controller
, and generates a voltage to be compared with the analog
Voltage comparator
register (SAR)
approximation
Successive
DD
at the supply voltage used (2.7 to 5.5 V).
A/D conversion result register
(ADCR, ADCRH)
D/A converter
INTAD
149
V
V
DD
SS