r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 453
r8a77850anbg
Manufacturer Part Number
r8a77850anbg
Description
Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R8A77850ANBG.pdf
(1692 pages)
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11. Local Bus State Controller (LBSC)
(2)
I/O Card Interface Timing
Figures 11.19 and 11.20 show the timing for the PCMCIA I/O card interface.
When a PCMCIA card is accessed as the I/O card interface, dynamic sizing with the I/O bus width
can be performed using the IOIS16 pin. With the 16-bit bus width selected, if the IOIS16 signal is
high during the word-size I/O bus cycle, the I/O port is recognized as eight bits in bus width. In
this case, a data access for only eight bits is performed in the I/O bus cycle being executed, and
this is automatically followed by a data access for the remaining eight bits. Dynamic bus sizing is
also performed for byte-size access to address 2n + 1.
Figure 11.21 shows the basic timing for dynamic bus sizing.
Rev.1.00 Jan. 10, 2008 Page 423 of 1658
REJ09B0261-0100
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