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Section 12 Bus State Controller (BSC)
Rev. 4.00 Sep. 14, 2005 Page 270 of 982
REJ09B0023-0400
Supports low-frequency and power-down modes.
Issues MRS and EMRS commands.
6. Byte-selection SRAM interface
Can connect directly to a byte-selection SRAM
7. Burst MPX-IO interface
Can connect directly to a peripheral LSI that needs an address/data multiplexing.
Supports burst transfer
8. Burst ROM interface (clock synchronous)
Can connect directly to a ROM of the clock synchronous type
9. Bus arbitration
Shares all of the resources with other CPU and outputs the bus enable after receiving the
bus request from external devices.
10. Refresh function
Supports the auto-refresh and self-refresh functions.
Specifies the refresh interval using the refresh counter and clock selection
Can execute concentrated refresh by specifying the refresh counts (1, 2, 4, 6, or 8)