M32C80 Datasheet, PDF (257/352 Pages) Renesas Technology Corp – 16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES

M32C/80 Group
18. D/A Converter
D/A Control Register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
DACON
Address
039C16
After Reset
XXXX XX002
Bit
Symbol
Bit Name
Function
RW
DA0E D/A0 Output Enable Bit
0: Disables an output
1: Enables an output
RW
DA1E D/A1 Output Enable Bit
0: Disables an output
1: Enables an output
RW
Nothing is assigned. When write, set to "0".
(b7 - b2) ^{When read, its content is indeterminate.}
D/A Register i (i=0, 1)
b7
b0
Symbol
DA0, DA1
Address
039816, 039A16
Function
Output value of D/A conversion
After Reset
Indeterminate
Setting Range RW
0016 to FF16
RW
Figure 18.2 DACON Register, DA0 and DA1 Registers
DA0E
r ^"0"
DA0
"1"
2R
MSB
D/A register 0
0
AVSS
VREF(4)
R
2R
1
R
2R
R
2R
R
2R
R
2R
R
2R
R
2R
2R
LSB
NOTES:
1. The above applies when the DA0 register is set to "2A16".
2. This circuitry is the same for D/A1.
3. To reduce power consumption when the D/A converter is not used, set the DAiE bit (i=0, 1) to "0"
(output disabled) and the DAi register to "0016" to stop current from flowing into the R-2R resistor.
4. VREF is not related to VCUT bit setting in the AD0CON1 register.
Figure 18.3 D/A Converter Equivalent Circuit
Rev. 1.00 Nov. 01, 2005 ^{Page 238} of 330
REJ09B0271-0100