SH7751 Datasheet, PDF (460/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

13. Bus State Controller (BSC)
Bits 4 to 0—Asynchronous Input: These bits enable asynchronous input for the corresponding
pins.
Bit 4–0: ASYNCn
0
1
Description
Corresponding pin is synchronous input with respect to CKIO (Initial value)
Asynchronous input with respect to CKIO is enabled for corresponding pin
Bit
4
IOIS16
3
DREQ1
2
DREQ0
1
BREQ
0
RDY
T1
Tw
CKIO
RDY
(BCR4.ASYNC0 = 0)
Tw
Twe
T2
RDY
(BCR4.ASYNC0 = 1)
Figure 13.4 Example of RDY Sampling Timing at which BCR4 Is Set
(Two Wait Cycles Are Inserted by WCR2)
Rev.4.00 Oct. 10, 2008 Page 362 of 1122
REJ09B0370-0400