h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 116

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

• Bus arbitration function
• Others
Rev. 2.00, 03/04, page 84 of 534
Includes a bus arbiter that arbitrates bus mastership between the CPU and DMAC
A refresh counter (refresh timer) can be used as an interval timer
DMAC bus acknowledge signal
CPU bus acknowledge signal
Internal data bus
[Legend]
ACSCR :
CSACR :
WTCR :
BCR :
RDNCR :
DRAMCR :
DRACCR :
REFCR :
RTCNT :
RTCOR :
Internal bus control signals
DMAC bus request signal
CPU bus request signal
Internal address bus
Access control register
CS assertion period control register
Wait control register
Bus control register
Read strobe timing control register
DRAM control register
DRAM access control register
Refresh control register
Refresh timer counter
Refresh time constant register
Figure 6.1 Block Diagram of Bus Controller
Control registers
RDNCR
ACSCR
CSACR
WTCR
BCR
Internal bus
External bus controller
Internal bus controller
arbiter
Area decoder
DRAMCR
DRACCR
RTCOR
REFCR
RTCNT
CS3 to CS0