mb91101 Fujitsu Microelectronics, Inc., mb91101 Datasheet - Page 38

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

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MB91101/MB91101A
2. DMA Controller (DMAC)
The DMA controller is a module embedded in FR family devices, and performs DMA (direct memory access)
transfer.
DMA transfer performed by the DMA controller transfers data without intervention of CPU, contributing to en-
hanced performance of the system.
• 8 channels
• Mode: single/block transfer, burst transfer and continuous transfer: 3 kinds of transfer
• Transfer all through the area
• Max 65536 of transfer cycles
• Interrupt function right after the transfer
• Selectable for address transfer increase/decrease by the software
• External transfer request input pin, external transfer request accept output pin, external transfer complete
• Block diagram
DREQ0 to DREQ2
output pin three pins for each
Inner resource
Transfer request
3
5
INC / DEC
detection circuit
Edge/level
Data buffer
BLK DEC
3
Sequencer
Switcher
DMACT
DACSR
DATCR
DPDP
SADR
DADR
Mode
BLK
3
3
8
DACK0 to DACK2
EOP0 to EOP2
Interrupt request