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4. A/D Converter
The H8/300L Series A/D converter is an on-chip resistor ladder successive approximations
A/D converter that allows the microcomputer to measure multiple analog input channel signals.
Features: • Eight-bit resolution
• Multiple analog input channel pins
• Conversion time: A minimum of 31/ø per channel (12.4 µs for an fosc of
10 MHz)
• Generates an interrupt at the completion of A/D conversion.
• Built-in sample and hold circuit
Block Diagram..
Analog input pins
AN
7
AN
6
AN
5
AN
Multiplexer
4
AN
3
AN
2
AN
1
AN
0
Analog system power
supply voltage
AV
CC
Reference
AV
SS
<Notation>
PMR0:
Port mode register 0
AMR:
A/D mode register
ADSR:
A/D start register
ADRR:
A/D result register
IRRAD:
A/D conversion complete interrupt request flag
Note: This figure shows the A/D converter circuit used in the H8/3724 Series.
+
Comparator
–
voltage
PMR0
AMR
ADSR
Control logic
ADRR
99
Peripheral Functions
IRRAD
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