UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 416

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(5) SAR: Successive Approximation Register
(6) ADCR: A/D Conversion Result Register
(7) Edge detection circuit
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The SAR is an 8-bit register in which the data for which the series resistor string voltage tap value matches the analog
input voltage value is set bit by bit starting from the most significant bit (MSB).
When data has been set up to the least significant bit (LSB) of the SAR (when A/D conversion is completed), the SAR
contents (conversion result) are stored in the A/D conversion result register (ADCR).
The ADCR is an 8-bit register that holds the A/D conversion result. The conversion result is loaded into this register
from the successive approximation register (SAR) each time A/D conversion finishes.
The contents of this register approxination are undefined when RESET is input.
The edge detection circuit detects a valid edge from the interrupt request input pin (INTP5) input, and generates an
external interrupt request signal (INTP5) and A/D conversion operation external trigger.
The INTP5 pin input valid edge is specified by external interrupt mode register 1 (INTM1) (see Figure 19-2). External
trigger enabling/disabling is set by means of the A/D converter mode register (ADM) (see 14.2 A/D Converter Mode
Register (ADM)).
CHAPTER 14 A/D CONVERTER