FUJITSU MB91460 SERIES FR60 - Manual (Page 931)

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Chapter 45 D/A Converter
7.Q & A
7. Q & A
7.1 Where should I set digital values?
Write digital values to the D/A Data Registers (DADR[7:0] for 8-bit mode, DADR[9:0] for 10-bit mode).
Access in a byte or halfword format.
D/A conversion begins immediately on writing.
7.2 How do I program the D/A pins for D/A output?
DA Pin output setting
Setting is accomplished by writing “1” to the output specification bits (PFR28.7 for DA1), (PFR28.6 for DA0).
(Switch the port to DA pin output by software programming.)
7.3 How do I enable or disable D/A output?
Use the D/A output control bits (DACR.DAE0), (DACR.DAE1).
O V (= AVss) is output when disabled. This is functional even while in a stopped state.
7.4 How do I activate a D/A conversion?
A conversion begins on writing a digital value. See 7.1.
7.5 What is the formula used to work out the value necessary to produce an expected
voltage?
Equation
Value = [{V (Expected analog value) x 1024} / (AV
CC
)]
To output 2.8 V from the pin with AV
CC
= 5.0V, for example.
(2.8V x 1024) / 5.0V = 573.44 => Value = 573
Pins Control bit location
DA0 pin PFR28.6 = ‘1’ DA0 Output specification bit (DA0)
DA1 pin PFR28.7 = ‘1’ DA1 Output specification bit (DA1)
Operations D/A output control bit (DAE)
To disable output Set “0”.
To enable output Set “1”.