r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 573

• Manufacturer Part Number: r5f21368sdfp
• Description: Renesas Mcu R8c Family / R8c/3xt-a Series
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36T-A Group
R01UH0240EJ0001 Rev.0.01
Apr 28, 2011
23.2.6
Notes:
After Reset
1. When the on-chip reference voltage is used as analog input, first set the ADEX0 bit to 1 (on-chip reference
2. Do not set to 1 (on-chip reference voltage selected) in single sweep mode or repeat sweep mode.
3. When the ADEX0 bit is 1 (on-chip reference voltage selected), the settings of bits CH0 to CH2 in the ADINSEL
4. When the on-chip reference voltage is used (ADEX0 = 1), set the ADDDAEN bit to 0 (A/D open-circuit detection
5. When the ADSTBY bit is changed from 0 (A/D operation stops) to 1 (A/D operation enabled), wait for one  AD
6. To enable the A/D open-circuit detection assist function, select the conversion start state with the ADDDAEL bit
7. When bits ADDDAEN and ADDDAEL are rewritten, allow at least one cycle of fAD to elapse before starting A/D
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 00217h
voltage selected) and then set the VREFMON bit in the OCVREFCR register to 1 (on-chip reference voltage and
analog input are connected).
When the on-chip reference voltage is not used as analog input, first set the VREFMON 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).
register and bits ADGSEL0 and ADGSEL1 (analog input AN0 to AN11 selected) are disabled, and on-chip
reference voltage is selected. When on-chip reference voltage is used, set bits CH2 to CH0 in the ADINSEL
register to 000b.
For details on the operation when 1 (on-chip reference voltage selected), refer to 23.3.7 On-Chip Reference
Voltage (OCVREF) .
assist function disabled).
cycle or more before starting A/D conversion.
after setting the ADDDAEN bit to 1 (enabled).
The conversion result with an open circuit varies according to external circuits. Careful evaluation should be
performed according to the system before using this function.
conversion.
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
Bit
Symbol
ADEX0
A/D Control Register 1 (ADCON1)
BITS
—
—
—
Preliminary document
Specifications in this document are tentative and subject to change.
b7
0
Extended analog input pin select bit
Reserved
8/10-bit mode select bit
A/D standby bit
function enable bit
method select bit
b6
0
Bit Name
(5)
(6, 7)
(4, 6, 7)
b5
0
BITS
b4
0
(1)
0: 8-bit mode
0: Extended analog input pin not selected
1: On-chip reference voltage selected
Set to 0.
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
b0
0
(2, 3, 4)
23. A/D Converter
Page 542 of 725
R/W
R/W
R/W
R/W
R/W
R/W
R/W