A/D And D/A Converter - Toshiba TC9314F Manual

A/D and D/A Converter

TC9314F incorporates a software-controlled successive approximation 6 bit A/D converter and a 6 bit D/A
converter. The A/D and D/A converters share pins with I/O port 3. Pin operation is set by the DA/AD control
port (φL20). Setting the DC REF ON bit to "1" sets P3-3 as reference voltage input (DC-REF). Setting the AD1
ON or AD2 ON bit to "1" sets P3-2 and P3-1 to AD analog voltage inputs (AD
ON bit to "1" sets P3-0 to DA analog voltage output (DA
In this case, the DA REF data 1 port (φL21) and DA REF data 2 port (φL22) set the A/D and D/A converter
control data.
The A/D and D/A converter consists of a 6 bit D/A converter, a comparator, an op-amp, and a control circuit.
Note 53: After a system reset, the DC REF ON bit, the AD1 ON bit, the AD2 ON bit, the DA ON bit, the SEL0 bit, and
the SEL1 bit are all reset to "0".
Note 54: The 6 bit D/A converter used to generate the reference voltage is shared by the A/D and D/A converters.
OUT
A/D and D/A Converter Structure
50
and AD
IN1
).
TC9314F
). Setting the DA
IN2
2003-07-03