Rev. 1.00, 09/03, page 92 of 704
Multiplex Extension:
The address output pins and data input/output pins are multiplex pins
•
Minimization of number of pins
It is possible to minimize the number of pins necessary for expansion by multiplexing the
address output pins and data input/output pins.
•
Usable areas
Areas 1, 2, and 3 are all usable
•
Multiplex extended bus interface
In the address cycle there are 2-state access fixed areas
In the data cycle 2-state access areas or 3-state access areas are able to be selected
The address cycle or data cycle can be independently inserted into the program wait state
•
Idle cycle insert
Idle cycle insert is possible during the external write cycle, directly after external read cycle
Bus
controller
External bus control signals
[Legend]
BCR:
BCRA1:
BCRA2:
BCRA3:
Bus control register
Basic area/area 1 control register
Area 2 control register
Area 3 control register
Internal control signals
Internal data bus
Wait
controller
BCRA1
BCRA3
Bus mode signal
BCR
BCRA2
Figure 6.1 Block Diagram of Bus Controller
Summary of Contents for H8S/2437
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