r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 350
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r5s72060w200fpv
Manufacturer Part Number
r5s72060w200fpv
Description
32-bit Risc Microcomputer Superhtm Risc Engine Family / Sh7200 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5S72060W200FPV.pdf
(1180 pages)
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Section 8 Bus State Controller (BSC)
8.5.8
SRAM Interface with Byte Selection
The SRAM interface with byte selection is for access to an SRAM which has a byte-selection pin
(WEn). This interface has 16-bit data pins and accesses SRAMs having upper and lower byte
selection pins, such as UB and LB.
When the BAS bit in CSnWCR is cleared to 0 (initial value), the write access timing of the SRAM
interface with byte selection is the same as that for the normal space interface. While in read
access of a byte-selection SRAM interface, the byte-selection signal is output from the WEn pin,
which is different from that for the normal space interface. The basic access timing is shown in
figure 8.37. In write access, data is written to the memory according to the timing of the byte-
selection pin (WEn). For details, please refer to the Data Sheet for the corresponding memory.
If the BAS bit in CSnWCR is set to 1, the WEn pin and RD/WR pin timings change. Figure 8.38
shows the basic access timing. In write access, data is written to the memory according to the
timing of the write enable pin (RD/WR). The data hold timing from RD/WR negation to data write
must be acquired by setting the HW1 and HW0 bits in CSnWCR. Figure 8.39 shows the access
timing when a software wait is specified.
Rev. 2.00 Dec. 09, 2005 Page 326 of 1152
REJ09B0191-0200
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