Datasheet

Section 6 Bus Controller (BSC)
Rev. 3.00 Mar 21, 2006 page 123 of 788
REJ09B0300-0300
6.2 Input/Output Pins
Table 6.1 summarizes the pins of the bus controller.
Table 6.1 Pin Configuration
Symbol I/O Function
AS Output Strobe signal indicating that address output on the address
bus is enabled (when the IOSE bit in SYSCR is cleared to 0).
IOS Output I/O select signal (when the IOSE bit in SYSCR is set to 1).
RD Output Strobe signal indicating that the external address space is
being read.
HWR Output Strobe signal indicating that the external address space is
being written to, and the upper half (D15 to D8) of the data
bus is enabled.
LWR Output Strobe signal indicating that the external address space is
being written to, and the lower half (D7 to D0) of the data bus
is enabled.
WAIT Input Wait request signal when accessing the external 3-state
access space.
6.3 Register Descriptions
The bus controller has the following registers. For details on the system control register, refer to
section 3.2.2, System Control Register (SYSCR).
• Bus control register (BCR)
• Wait state control register (WSCR)