SH7713 Datasheet, PDF (391/904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 12 Bus State Controller (BSC)
12.4.3 CSn Space Wait Control Register (CSnWCR) (n = 0, 2, 3, 4, 5A, 5B, 6A, 6B)
This register specifies various wait cycles for memory accesses. The bit configuration of this
register varies as shown below according to the memory type (TYPE3, TYPE2, TYPE1, or
TYPE0) specified by the CSn space bus control register (CSnBCR). Specify CSnWCR before
accessing the target area. Specify CSnBCR first, then specify CSnWCR.
Normal Space, Byte-Selection SRAM:
• CS0WCR, CS6BWCR
Bit
31 to
21
20
19 to
13
12
11
Initial
Bit Name Value R/W

All 0 R
BAS
0
R/W

All 0 R
SW1
0
R/W
SW0
0
R/W
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
Byte Access Selection for Byte-Selection SRAM
Specifies the WEn (BEn) and RD/WR signal timing when
the byte-selection SRAM interface is used.
0: Asserts the WEn (BEn) signal at the read/write timing
and asserts the RD/WR signal during the write access
cycle.
1: Asserts the WEn (BEn) signal during the read/write
access cycle and asserts the RD/WR signal at the write
timing.
Reserved
These bits are always read as 0. The write value should
always be 0.
Number of Delay Cycles from Address, CSn Assertion to
RD, WEn (BEn) Assertion
Specify the number of delay cycles from address and CSn
assertion to RD and WEn (BEn) assertion.
00: 0.5 cycle
01: 1.5 cycles
10: 2.5 cycles
11: 3.5 cycles
Rev.1.50 Aug. 30, 2006 Page 351 of 860
REJ09B0288-0150