upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 369

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

11.2 Configuration
The A/D converter includes the following hardware.
(1)
Remark:
(2)
(3)
(4)
Successive approximation register (SAR)
This register compares the voltage value of the analog input signal with the voltage tap (compare
voltage) value from the series resistor string, and holds the comparison result starting from the
most significant bit (MSB).
When the comparison result has been held down to the least significant bit (LSB) (i.e. when A/D
conversion has been completed), the contents of the SAR register are transferred to the A/D
conversion result ADA0CRn register.
Sample & hold circuit
The sample & hold circuit samples each of the analog input signals sequentially sent from the
input circuit and sends the sampled data to the voltage comparator. This circuit also holds the
sampled analog input signal voltage during A/D conversion.
Voltage comparator
The voltage comparator compares a voltage value that has been sampled and held with the
voltage value of the series resistor string.
Series resistor string
This series resistor string is connected between AV
comparison with the analog input signal.
Analog inputs
Registers
Control registers
n = 0 to 15
Item
16 channels (ANI0 to ANI15)
Successive approximation register (SAR)
A/D conversion result registers 0 – 15 (ADA0CRn)
A/D diagnostic mode conversion result registers (ADA0CRDD, ADA0CRSS)
A/D converter mode registers 0 to 1 (ADSCM0H, ADSCM0L, ADSCM1H)
A/D converter extended mode control register (ADVMS0)
A/D external trigger selection register (SELCNT1)
Table 11-1: Configuration of A/D Converter
User’s Manual U16702EE3V2UD00
Chapter 11 A/D Converter
Configuration
REF0
and AV
SS
and generates a voltage for
369