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Operation
Chapter 15 A/D Converter
XV - 11
Built-in Ladder Resistor Control
The ANLADE flag of the ANCTR0 register is set to "1" to send a current to the ladder resistance for A/
D conversion. As A/D converter is stopped, the ANLADE flag of the ANCTR0 register is set to "0" to save
the power consumption.
Table 15-3-4 A/D Ladder Resistor Control
A/D Conversion Activation Factor Selection Setup
The A/D conversion activation factor is set by the ANSTSEL flag of the ANCTR2 register. The ANSTSEL
flag of the ANCTR2 register is set to "1" to start A/D conversion by the external interrupt 3. And if the
ANST flag of the ANCTR2 register is set to "1", A/D conversion can be started.
Table 15-3-5 A/D Conversion Activation Factor Selection
A/D Conversion Starting Setup
A/D conversion starting is set by the ANST flag of the ANCTR2 register. The ANST flag of the ANCTR2
register is set to "1" to start A/D conversion. When the external interrupt 3 is selected as the A/D conver-
sion activation factor, the ANST flag of the ANCTR2 register is set to "1" to start A/D conversion, as the
external interrupt 3 is generated. Also, the ANST flag of the ANCTR2 register is set to "1" during A/D
conversion, then cleared to "0" as the A/D conversion complete interrupt is generated.
Table 15-3-6 A/D Conversion Starting
Specify the interrupt valid edge before the external interrupt 3 is selected as the A/D conver-
sion activation factor.
If the external interrupt 3 is selected as the A/D conversion activation factor, specify the valid
edge by the REDG3 flag of the external interrupt 3 control register (IRQ3ICR), and the
EDGSEL3 flag of the both edges interrupt control register (EDGDT).
[ Chapter 3. 3-3 External Interrupts ]
ANLADE A/D ladder resistance control
0 A/D ladder resistance OFF (A/D conversion stopped)
1 A/D ladder resistance ON (A/D conversion operated)
ANSTSEL A/D conversion activation factor
1 The external interrupt 3, or set the ANST flag to "1".
0 Set the ANST flag to "1".
ANST A/D conversion status
1 A/D conversion started or in progress.
0 A/D conversion completed or stopped.