r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 696

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 External CPU Interface (EXCPU)
(3)
External CPU access through the EXCPU is done through handshaking of the access request
(BREQ) and access acknowledge (BACK) signals.
Figures 15.2 and 15.3 show the access timing of the EXCPU and external CPU.
Rev. 1.00 Oct. 01, 2007 Page 630 of 1956
REJ09B0256-0100
Timing Charts of External CPU Access
Read access
Write access
CLKOUT
BREQ
BACK
EX_CS0
EX_BS
EX_FRAME
EX_RDWR
EX_AD [31:0]
EX_RDY
CLKOUT
BREQ
BACK
EX_CS0
EX_BS
EX_FRAME
EX_RDWR
EX_AD [31:0]
EX_RDY
High
Low
Figure 15.2 External CPU Access (Single Access)
A0
A0
D0
D0