UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 291

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

(2) 10-bit A/D conversion result register (ADCR)
Symbol
Note For details of wait period, see CHAPTER 31 CAUTIONS FOR WAIT.
ADCR
Cautions 1. When writing to the A/D converter mode register (ADM), analog input channel specification
This register is a 16-bit register that stores the A/D conversion result. The lower 6 bits are fixed to 0. Each time
A/D conversion ends, the conversion result is loaded from the successive approximation register, and is stored in
ADCR in order starting from bit 7 of FF19H. FF19H indicates the higher 8 bits of the conversion result, and
FF18H indicates the lower 2 bits of the conversion result.
ADCR can be read by a 16-bit memory manipulation instruction.
Reset signal generation clears this register to 0000H.
Sampling
INTAD
ADCS
timing
Address: FF18H, FF19H
2. If data is read from ADCR, a wait cycle is generated. Do not read data from ADCR when the
ADCS
register (ADS), and A/D port configuration register (ADPC), the contents of ADCR may
become undefined.
writing to ADM, ADS, and ADPC. Using timing other than the above may cause an incorrect
conversion result to be read.
CPU is operating on the subsystem clock and the peripheral hardware clock is stopped. For
details, see CHAPTER 31 CAUTIONS FOR WAIT.
Figure 13-6. Format of 10-Bit A/D Conversion Result Register (ADCR)
Figure 13-5. A/D Converter Sampling and A/D Conversion Timing
period
1 or ADS rewrite
Wait
Note
FF19H
clear
SAR
After reset: 0000H
Read the conversion result following conversion completion before
Sampling time
CHAPTER 13 A/D CONVERTER
User’s Manual U17554EJ4V0UD
Conversion time
R
conversion time
Successive
generation
to ADCR,
Transfer
INTAD
0
clear
SAR
0
FF18H
Conversion time
0
Sampling time
0
0
0
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