HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 185

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

• Transfer requests
• Selectable bus modes: Cycle-steal mode or burst mode
• Selectable channel priority levels: Fixed, round-robin, or external-pin round-robin modes
• CPU can be asked for interrupt when data transfer ends
• Maximum transfer rate
9.1.2
Figure 9.1 is a block diagram of the DMAC.
170 HITACHI
Two on-chip peripheral modules (excluding DMAC)
External request (From DREQ pins (channels 0 and 1 only). DREQ can be detected either
Requests from on-chip peripheral modules (serial communications interface (SCI), and 16-
Auto-request (the transfer request is generated automatically within the DMAC)
20 M words/s (320 MB/s)
by edge or by level)
bit integrated-timer pulse unit (ITU))
For 5V and 20 MHz
Bus mode: Burst mode
Transmit size: Word
Block Diagram