UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 315

• Manufacturer Part Number: UPD78F0537DGA(T)-9EV-A
• Description: 8BIT MCU, 128K FLASH, 7KB RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F0537DGA(T)-9EV-A

• Controller Family/series: UPD78
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

<R>
<R>
<R>
13.3 Registers Used in A/D Converter
(1) A/D converter mode register (ADM)
The A/D converter uses the following six registers.
• A/D converter mode register (ADM)
• A/D port configuration register (ADPC)
• Analog input channel specification register (ADS)
• Port mode register 2 (PM2)
• 10-bit A/D conversion result register (ADCR)
• 8-bit A/D conversion result register (ADCRH)
This register sets the conversion time for analog input to be A/D converted, and starts/stops conversion.
ADM can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Notes 1.
Note Ignore data of the first conversion.
Symbol
Address: FF28H
2.
ADM
ADCS
0
0
1
1
For details of FR2 to FR0, LV1, LV0, and A/D conversion, see Table 13-2 A/D Conversion Time
Selection.
The operation of the comparator is controlled by ADCS and ADCE, and it takes 1
start to operation stabilization. Therefore, when ADCS is set to 1 after 1
the time ADCE is set to 1, the conversion result at that time has priority over the first conversion
result. Otherwise, ignore data of the first conversion.
ADCS
ADCE
ADCS
<7>
0
1
0
1
ADCE
Figure 13-3. Format of A/D Converter Mode Register (ADM)
0
1
0
1
After reset: 00H
Stops conversion operation
Enables conversion operation
Stops comparator operation
Enables comparator operation
6
0
Stop status (DC power consumption path does not exist)
Conversion waiting mode (comparator operation, only comparator consumes
power)
Conversion mode (comparator operation stopped
Conversion mode (comparator operation)
Table 13-1. Settings of ADCS and ADCE
FR2
CHAPTER 13 A/D CONVERTER
5
User’s Manual U17260EJ6V0UD
R/W
Note 1
FR1
A/D conversion operation control
Comparator operation control
4
Note 1
A/D Conversion Operation
FR0
3
Note 1
LV1
2
Note 1
Note
Note 2
)
LV0
µ
1
Note 1
s or more has elapsed from
ADCE
<0>
µ
s from operation
315