UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 161

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

10.2 Configuration of A/D Converter
(1) ANI0 to ANI3 pins
(2) Sample & hold circuit
(3) D/A converter
(4) Voltage comparator
Analog input
channel specification
register (ADS)
ANI0/P20
ANI1/P21
ANI2/P22
ANI3/P23
Figure 10-2 shows the block diagram of A/D converter.
Caution In the 78K0S/KA1+, V
The A/D converter consists of the following hardware.
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 I/O 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 AV
analog input signal.
The voltage comparator compares the sampled analog input voltage and the output voltage of the D/A converter.
sure to connect V
ADS1
2
ADS0
ADCS
SS
Sample & hold circuit
Figure 10-2. Block Diagram of A/D Converter
to a stabilized GND (= 0 V).
FR2
SS
Internal bus
functions alternately as the ground potential of the A/D converter. Be
FR1
CHAPTER 10 A/D CONVERTER
V
3
SS
A/D converter mode
register (ADM)
User’s Manual U16898EJ5V0UD
FR0
REF
ADCE
and V
Controller
Voltage comparator
approximation
register (SAR)
Successive
SS
, and generates a voltage to be compared with the
A/D conversion result register
(ADCR, ADCRH)
D/A converter
INTAD
AV
V
161
SS
REF