tmp89fm42a TOSHIBA Semiconductor CORPORATION, tmp89fm42a Datasheet - Page 322

• Manufacturer Part Number: tmp89fm42a
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA002
20. 10-bit AD Converter (ADC)
20.1
converter, a sample-hold circuit, a comparator, a successive comparison circuit, etc.
Note 1: Before using the AD converter, set an appropriate value to the I/O port register which is also used as an analog input port.
Note 2: The DA converter current (IREF) is automatically cut off at times other than during AD conversion.
VAREF/AVDD
The TMP89FM42A has a 10-bit successive approximation type AD converter.
The circuit configuration of the 10-bit AD converter is shown in Figure 20-1.
It consists of control registers ADCCR1 and ADCCR2, converted value registers ADCDRL and ADCDRH, a DA
Configuration
AIN0
AIN7
For details, see the section on "I/O ports".
SAIN
Input selector
4
n
A
S EN
Y
AINDS
Figure 20-1 10-bit AD Converter
AD converter control registers 1 and 2
ADCCR1
R/2
Sample-hold
circuit
R
Page 303
AMD
2
Analog
comparator
Shift clock
Control circuit
Reference
voltage
DA converter
ACK
3
ADCCR2
approximation circuit
AD converted value registers 1 and 2
ADCDRL
Successive
R/2
10
10
8
VSS
ADCDRH
Selector
8
TMP89FM42A
INTADC