r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 613

• 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
28.2.1
Note:
1. When on-chip reference voltage is used as analog input, first set the ADEX0 bit in the ADCON1 register to 1 (on-
After Reset
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 0026h
chip reference voltage selected) and then set the OCVREFAN bit 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).
Set the PRC3 bit in the PRCR register to 1 (write enabled) before rewriting the OCVREFCR register.
If the contents of the OCVREFCR register are rewritten during A/D conversion, the conversion result is
undefined.
Symbol
Registers
OCVREFAN On-chip reference voltage to
Bit
Symbol
On-Chip Reference Voltage Control Register (OCVREFCR)
—
—
—
—
—
—
—
b7
—
0
analog input connect bit
Reserved bits
b6
—
0
Bit Name
b5
—
0
(1)
b4
—
0
0: On-chip reference voltage and analog input are cut off
1: On-chip reference voltage and analog input are
Set to 0.
connected
b3
—
0
b2
—
0
Function
b1
—
0
OCVREFAN
b0
0
28. A/D Converter
Page 581 of 740
R/W
R/W
R/W