Chapter 16
A/D Converter (ADC)
XVI - 2 Overview
16.1 Overview
This LSI has an analog-to-digital converter (ADC) with 12 bits resolutions. This ADC has a sample hold circuit,
the channel 0 to channel 7 (AN0 to AN7) of analog input can be switched by software.
When the ADC is stopped, the power consumption can be reduced by turning the A/D resistor ladder off.
The ADC is activated by setting a register, an external interrupt, a timer 7 interrupt and an A/D conversion inter-
rupt.
16.1.1 Functions
Table:16.1.1 shows the ADC functions.
Table:16.1.1 ADC Functions
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This function can not be used in STOP/HALT mode.
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Do not execute mode switching as follows;
- Normal operation state (NORMAL) to Low-speed operation state (SLOW)
- Low-speed operation state (SLOW) to Idle state (IDLE) to Normal operation state (NOR-
MAL)
If the above mode switching is executed, the result of A/D conversion can not be guaranteed.
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To realize a low power consumption, it is recommended that the A/D resistor ladder is turned
off while the A/D conversion is not executed.
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Function Content
Number of A/D Input Pins 8 pins
Pin Name AN7 to AN0
Interrupt ADIRQ
Resolution 12 bits
Conversion Time (Minimum)
15.38 µs (at T
ADCLK
= 750 ns)
Input Range
V
SS
to V
REFP
Power Reduction A/D resistor ladder (ON/OFF)
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