M16C6K9 Datasheet, PDF (142/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
D-A Converter
D-A control register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
DACON
Address
03DC16
When reset
0016
Bit symbol
Bit name
DA0E
D-A0 output enable bit
Function
0 : Output disabled
1 : Output enabled
RW
DA1E
D-A1 output enable bit
0 : Output disabled
1 : Output enabled
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”
D-A register
b7
Symbol
Address
When reset
b0
DAi (i = 0,1) 03D816, 03DA16 Indeterminate
Function
Output value of D-A conversion
R^{R W}W
Fig.JB-2 D-A control register
D-A0 output enable bit
"0"
R
R
R
R
R
R
R
2R
DA0
"1"
2R
2R
2R
2R
2R
2R
2R
2R
MSB
LSB
D-A0 register0
AVSS
VREF
Note 1: The above diagram shows an instance in which the D-A register is assigned 2A16.
Note 2: The same circuit as this is also used for D-A1.
Note 3: To reduce the current consumption when the D-A converter is not used, set the D-A output enable bit to 0 and set the D-A register to 0016
Do not let current flows through R-2R resistors.
Fig.JB-3 D-A converter equivalent circuit
Rev.1.00 Jun 06, 2003 page 142 of 290