Section 6
Bus Controller (BSC)
Rev.2.00 Jun. 28, 2007 Page 191 of 666
REJ09B0311-0200
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
Pin
When Byte
Control
SRAM is
Specified Name
I/O Function
CSn
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
RD
RD
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 bytes (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 bytes (D7 to D0)
is valid when the address/data multiplexed I/O space
is written
D15 to D0
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
A23 to A0
Address
Output
Address output pin
WAIT
WAIT
Wait
Input
Wait request signal used when the external address
space is accessed
BS
BS
Bus cycle start Output
Signal to indicate the bus cycle start
RD/
WR
RD/
WR
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.
Содержание H8SX/1650
Страница 2: ...Rev 2 00 Jun 28 2007 Page ii of xxii...
Страница 106: ...Section 4 Exception Handling Rev 2 00 Jun 28 2007 Page 84 of 666 REJ09B0311 0200...
Страница 142: ...Section 5 Interrupt Controller Rev 2 00 Jun 28 2007 Page 120 of 666 REJ09B0311 0200...
Страница 326: ...Section 8 I O Ports Rev 2 00 Jun 28 2007 Page 304 of 666 REJ09B0311 0200...
Страница 470: ...Section 12 Watchdog Timer WDT Rev 2 00 Jun 28 2007 Page 448 of 666 REJ09B0311 0200...
Страница 546: ...Section 13 Serial Communication Interface SCI Rev 2 00 Jun 28 2007 Page 524 of 666 REJ09B0311 0200...
Страница 566: ...Section 14 A D Converter Rev 2 00 Jun 28 2007 Page 544 of 666 REJ09B0311 0200...
Страница 574: ...Section 16 RAM Rev 2 00 Jun 28 2007 Page 552 of 666 REJ09B0311 0200...
Страница 584: ...Section 17 Clock Pulse Generator Rev 2 00 Jun 28 2007 Page 562 of 666 REJ09B0311 0200...
Страница 638: ...Section 19 List of Registers Rev 2 00 Jun 28 2007 Page 616 of 666 REJ09B0311 0200...
Страница 668: ...Section 20 Electrical Characteristics Rev 2 00 Jun 28 2007 Page 646 of 666 REJ09B0311 0200...
Страница 676: ...Appendix Rev 2 00 Jun 28 2007 Page 654 of 666 REJ09B0311 0200...
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