H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 181
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H8S-2350
Manufacturer Part Number
H8S-2350
Description
16-Bit Single-Chip Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.H8S-2350.pdf
(1025 pages)
- Current page: 181 of 1025
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6.3.6
The H8S/2350 Group can output chip select signals (CS0 to CS7) to areas 0 to 7, the signal being
driven low when the corresponding external space area is accessed. In normal mode, only the CS0
signal can be output.
Figure 6.3 shows an example of CSn (n = 0 to 7) output timing.
Enabling or disabling of the CSn signal is performed by setting the data direction register (DDR)
for the port corresponding to the particular CSn pin.
In ROM-disabled expansion mode, the CS0 pin is placed in the output state after a power-on reset.
Pins CS1 to CS7 are placed in the input state after a power-on reset, and so the corresponding
DDR should be set to 1 when outputting signals CS1 to CS7.
In the H8S/2351’s ROM-enabled expansion mode, pins CS0 to CS7 are all placed in the input
state after a power-on reset, and so the corresponding DDR bits should be set to 1 when outputting
signals CS0 to CS7.
For details, see section 9, I/O Ports.
When areas 2 to 5 are designated as DRAM space, outputs CS2 to CS5 are used as RAS signals.
Chip Select Signals
Address bus
CSn
Figure 6.3 CSn
CSn
CSn
CSn Signal Output Timing (n = 0 to 7)
T
1
Area n external address
Bus cycle
T
2
Rev. 3.00 Sep 15, 2006 page 147 of 988
T
3
Section 6 Bus Controller
REJ09B0330-0300
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