Datasheet

Section 6 Bus Controller
Rev. 4.00 Jun 06, 2006 page 139 of 1004
REJ09B0301-0400
6.1.3 Pin Configuration
Table 6.1 summarizes the pins of the bus controller.
Table 6.1 Bus Controller Pins
Name Symbol I/O Function
Address strobe AS Output Strobe signal indicating that address output on
address bus is enabled (when IOSE bit is 0)
I/O select IOS Output I/O select signal (when IOSE bit is 1)
Read RD Output Strobe signal indicating that external space is
being read
Write WR Output Strobe signal indicating that external space is
being written to, and that data bus is enabled
Wait WAIT Input Wait request signal when external 3-state access
space is accessed
6.1.4 Register Configuration
Table 6.2 summarizes the registers of the bus controller.
Table 6.2 Bus Controller Registers
Name Abbreviation R/W Initial Value Address
*
Bus control register BCR R/W H'D7 H'FFC6
Wait state control register WSCR R/W H'33 H'FFC7
Note: * Lower 16 bits of the address.