H8SX1663 datasheet(271/1158 Pages) RENESAS

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Section 6 Bus Controller (BSC)

Rev.1.00 Jun. 07, 2006 Page 219 of 1102

REJ09B0294-0100

6.9.4

I/O Pins Used for Address/Data Multiplexed I/O Interface

Table 6.19 shows the pins used for the address/data multiplexed I/O Interface.

Table 6.19

I/O Pins for Address/Data Multiplexed I/O Interface

When Byte

Control

SRAM is

Specified

Name

I/O

Function

CSn

Chip select

Output

Chip select (n = 3 to 7) when area n is specified as the

address/data multiplexed I/O space

AS/AH

AH*

Address hold

Output

Signal to hold an address when the address/data

multiplexed I/O space is specified

Read strobe

Output

Signal indicating that the address/data multiplexed I/O

space is being read

LHWR/LUB

LHWR

Low-high write Output

Strobe signal indicating that the upper byte (D15 to

D8) is valid when the address/data multiplexed I/O

space is written

LLWR/LLB

LLWR

Low-low write

Output

Strobe signal indicating that the lower byte (D7 to D0)

is valid when the address/data multiplexed I/O space is

written

D15 to D0

Address/data

Input/

output

Address and data multiplexed pins for the

address/data multiplexed I/O space.

Only D7 to D0 are valid when the 8-bit space is

specified. D15 to D0 are valid when the 16-bit space is

specified.

A23 to A0

Address

Output

Address output pin

WAIT

Wait

Input

Wait request signal used when the external address

space is accessed

Bus cycle start Output

Signal to indicate the bus cycle start

RD/

Read/write

Output

Signal indicating the data bus input or output direction

Note:

The

AH output is multiplexed with the AS output. At the timing that an area is specified

as address/data multiplexed I/O, this pin starts to function as the

AH output meaning

that this pin cannot be used as the

AS output. At this time, when other areas set to the

basic bus interface is accessed, this pin does not function as the

AS output. Until an

area is specified as address/data multiplexed I/O, be aware that this pin functions as

the

AS output.

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