r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 757

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Figure 14.21 Example 2 of DREQ Input Detection in Burst Mode Level Detection (Word
Transfer in 8-Bit Bus Width, Longword Transfer in 8/16-Bit Bus Width, 16/32-Byte
CLKOUT
Bus cycle
DREQ
(Overrun 0, High level)
DRAK (High-active)
DACK (High-active)
CLKOUT
Bus cycle
DREQ
(Overrun 1, High level)
DRAK (High-active)
DACK (High-active)
Transfer in 8/16/32/64-Bit Bus Width: DACK of DMA1 Transfer Divided)
1st acceptance
1st acceptance
: Non-sensitive period
CPU
CPU
2nd acceptance
Acceptance started
Accepted after one cycle of CLKOUT
at the first rising edge of the divided-up DACK
DMAC
DMAC
14. Direct Memory Access Controller (DMAC)
Rev.1.00 Jan. 10, 2008 Page 727 of 1658
2nd acceptance
Acceptance started
Accepted after one cycle of CLKOUT
at the first falling edge of the divided-up DACK
REJ09B0261-0100