mb91101 Fujitsu Microelectronics, Inc., mb91101 Datasheet - Page 50

• Manufacturer Part Number: mb91101
• Description: 32-bit Risc Microcontroller Cmos
• Manufacturer: Fujitsu Microelectronics, Inc.

50
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 s/ch. (system clock: 25 MHz)
• Inner sample and hold circuit
• Resolution: 10 bits
• Analog input can be selected from 4 channels by program.
• 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
• Block diagram
(rising edge).
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:
(Peripheral clock)
TIM2
(Output signal of 16-bit reload timer ch.2)
AN0
AN1
AN2
AN3
ATG
MPX
Trigger start
After converting one channel then stop and wait till next activation synchronizing at
the beginning of conversion can be performed.
Sample & hold circuit
Timer start
Comparator
A/D control register (ADCS)
Successive approximation
Internal voltage generator
Data register (ADCR)
AV
CC
Prescaler
register
AVR
Operating clock
AV
SS