r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 618

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
28.2.6
Notes:
1. When on-chip reference voltage is used as analog input, first set the ADEX0 bit to 1 (on-chip reference voltage
2. Do not set to 1 (A/D conversion using comparison reference voltage as input) in single sweep mode or repeat
3. When the ADSTBY bit is changed from 0 (A/D operation stops) to 1 (A/D operation enabled), wait for 1 φ AD cycle
4. Stop the A/D function before setting to standby. When the ADSBY bit is set to 1 (standby), any access to the A/D
5. To enable the A/D open-circuit detection assist function, select the conversion start state with the ADDDAEL bit
6. When on-chip reference voltage is used (ADEX0 = 1), set bits CH2 to CH0 in the ADINSEL register to 000b.
7. When on-chip reference voltage is used (ADEX0 = 1), set the ADDDAEN bit to 0 (A/D open-circuit detection
After Reset
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 00D7h
selected) and then set the OCVREFAN bit in the OCVREFCR register to 1 (on-chip reference voltage and analog
input are connected).
When on-chip reference voltage is not used as analog input, first set the OCVREFAN bit to 0 (on-chip reference
voltage and analog input are cut off) and then set the ADEX0 bit to 0 (extended analog input pin not selected).
sweep mode.
or more before starting A/D conversion.
associated registers (addresses 00C0h to 00CFh, and 00D4h to 00D7h) is disabled.
after setting the ADDDAEN bit to 1 (enabled).
The conversion result with an open circuit varies with external circuits. Careful evaluation should be performed
according to the system before using this function.
assist function disabled).
If the ADCON1 register is rewritten during A/D conversion, the conversion result is undefined.
Symbol ADDDAEL ADDDAEN ADSTBY
ADDDAEN A/D open-circuit detection assist
ADDDAEL A/D open-circuit detection assist
ADSTBY A/D standby bit
Bit
Symbol
ADEX0
A/D Control Register 1 (ADCON1)
BITS
—
—
—
b7
0
Extended analog input pin select bit
Reserved bits
8/10-bit mode select bit
function enable bit
method select bit
b6
0
Bit Name
(3)
(5)
(5. 7)
b5
0
BITS
b4
0
(1)
0: Extended analog input pin not selected
1: On-chip reference voltage selected
Set to 0.
0: 8-bit mode
1: 10-bit mode
0: A/D operation stops (standby)
1: A/D operation enabled
0: Disabled
1: Enabled
0: Discharge before conversion
1: Precharge before conversion
b3
—
0
b2
—
0
Function
b1
—
0
ADEX0
(4)
b0
0
(2. 6. 7)
28. A/D Converter
Page 586 of 740
R/W
R/W
R/W
R/W
R/W
R/W
R/W