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7.1.3 Pin Configuration
Table 7-1 summarizes the pins of the bus controller.
Table 7-1 Bus Controller Pins
Name Symbol I/O Function
Address strobe AS Output Strobe signal indicating that address output on address
bus is enabled.
Read RD Output Strobe signal indicating that external space is being
read.
High write HWR Output Strobe signal indicating that external space is to be
written, and upper half (D15 to D8) of data bus is
enabled.
Low write LWR Output Strobe signal indicating that external space is to be
written, and lower half (D7 to D0) of data bus is enabled.
Wait WAIT Input Wait request signal used when accessing external
3-state access space.
7.1.4 Register Configuration
Table 7-2 summarizes the registers of the bus controller.
Table 7-2 Bus Controller Registers
Name Abbreviation R/W Initial Value Address
*1
Bus width control register ABWCR R/W H'FF/H'00
*2
H'FED0
Access state control register ASTCR R/W H'FF H'FED1
Wait control register H WCRH R/W H'FF H'FED2
Wait control register L WCRL R/W H'FF H'FED3
Bus control register H BCRH R/W H'D0 H'FED4
Bus control register L BCRL R/W H'08 H'FED5
Pin function control register PFCR R/W H'0D/H'00 H'FDEB
Notes: *1 Lower 16 bits of the address.
*2 Determined by the MCU operating mode.
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