DS07-16301-4E Datasheet, PDF (50/99 Pages) Fujitsu Component Limited. – 32-bit RISC Microcontroller CMOS FR30 Series

MB91101/MB91101A
8. 10-bit A/D Converter (Successive Approximation Conversion Type)
The A/D converter is the module which converts an analog input voltage to a digital value, and it has following
features.
• Minimum converting time: 5.6 µs/ch. (system clock: 25 MHz)
• Inner sample and hold circuit
• Resolution: 10 bits
• Analog input can be selected from 4 channels by program.
Single convert mode: 1 channel is selected and converted.
Scan convert mode: Converting continuous channels. Maximum 4 channels are programmable.
Continuous convert mode: Converting the specified channel repeatedly.
Stop convert mode: After converting one channel then stop and wait till next activation synchronizing at
the beginning of conversion can be performed.
• DMA transfer operation is available by interruption.
• Operating factor can be selected from the software, the external trigger (falling edge), and 16-bit reload timer
(rising edge).
• Block diagram
AVCC AVR AVSS
MPX
AN0
AN1
AN2
AN3
Comparator
Sample & hold circuit
Internal voltage generator
Successive approximation
register
Data register (ADCR)
ATG
Trigger start
TIM2
Timer start
(Output signal of 16-bit reload timer ch.2)
φ
(Peripheral clock)
50
A/D control register (ADCS)
Operating clock
Prescaler