Rev. 3.0, 10/02, page 101 of 686
6.2
Input/Output Pins
Table 6.1 summarizes the pins of the bus controller.
Table 6.1
Pin Configuration
Name
Symbol
I/O
Function
Address strove
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.
Chip select 0 to 7
CS0
to
CS7
Output
Strobe signal indicating that areas 0 to 7 are selected.
Wait
WAIT
Input
Wait request signal when accessing external 3-state
access space.
Bus request
BREQ
Input
Request signal that releases bus to external device.
Bus request
acknowledge
BACK
Output
Acknowledge signal indicating that bus has been
released.
6.3
Register Descriptions
The following shows the registers of the bus controller.
•
Bus width control register (ABWCR)
•
Access state control register (ASTCR)
•
Wait control register H (WCRH)
•
Wait control register L (WCRL)
•
Bus control register H (BCRH)
•
Bus control register L (BCRL )
•
Pin function control register (PFCR)
6.3.1
Bus Width Control Register (ABWCR)
ABWCR designates each area for either 8-bit access or 16-bit access.
Summary of Contents for H8S/2215 Series
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