R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 135

• Manufacturer Part Number: R5F21133DFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY/R8C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

R8C/13 Group
Rev.1.20
REJ09B0111-0120
14. A/D Converter
NOTES:
Table 14.1 Performance of A/D converter
Method of A/D conversion Successive approximation (capacitive coupling amplifier)
Analog input voltage
Operating clock
Resolution
Integral nonlinearity error
Operating modes
Analog input pins
A/D conversion start condition ADST bit in ADCON0 register is set to “1” (A/D conversion starts)
Conversion speed per pin • Without sample and hold function
1. Does not depend on use of sample and hold function.
2. The frequency of
3. In repeat mode, only 8-bit mode can be used.
The A/D converter consists of one 10-bit successive approximation A/D converter circuit with a capacitive
coupling amplifier. The analog inputs share the pins with P0
using these pins, make sure the corresponding port direction bits are set to “0” (input mode).
When not using the A/D converter, set the VCUT bit to “0” (Vref unconnected), so that no current will flow
from the V
The result of A/D conversion is stored in the AD register.
Table 14.1 shows the performance of the A/D converter. Figure 14.1 shows a block diagram of the A/D
converter, and Figures 14.2 and 14.3 show the A/D converter-related registers.
When AVcc is less than 4.2V,
Without sample and hold function, the
With the sample and hold function, the
Jan 27, 2006
Item
REF
pin into the resistor ladder, helping to reduce the power consumption of the chip.
AD (2)
(1)
page 124 of 205
AD
must be 10 MHz or less.
0V to Vref
AV
AV
8-bit or 10-bit (selectable)
AVcc = Vref = 5V
• 8-bit resolution ±2 LSB
• 10-bit resolution ±3 LSB
AVcc = Vref = 3.3 V
• 8-bit resolution ±2 LSB
• 10-bit resolution ±5 LSB
One-shot mode and repeat mode
12 pins (AN
• With sample and hold function
8-bit resolution: 49
8-bit resolution: 28
CC
CC
= 5V f
= 3V divide-by-2 of f
AD
must be f
0
AD
to AN
AD
, divide-by-2 of f
AD
frequency should be 250 kHz or more.
11
frequency should be 1 MHz or more.
AD
)
AD
AD
/2 or less by dividing f
cycles, 10-bit resolution: 59
cycles, 10-bit resolution: 33
AD
, divide-by-4 of f
Performance
AD
(3)
, divide-by-4 of f
0
to P0
7
AD
and P1
AD
.
AD
0
to P1
AD
AD
cycles
cycles
3
. Therefore, when
14. A/D Converter