r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 754

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

14. Direct Memory Access Controller (DMAC)
Rev.1.00 Jan. 10, 2008 Page 724 of 1658
REJ09B0261-0100
(Word Transfer in 8-Bit Bus Width, Longword Transfer in 8/16-Bit Bus Width, 16/32-Byte
Figure 14.17 Example 2 of DREQ Input Detection in Cycle Steal Mode Level Detection
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
: Non-sensitive period
CPU
CPU
2nd acceptance
DMAC
DMAC
Acceptance started
Accepted after one cycle of CLKOUT
at the first rising edge of the divided-up DACK
2nd acceptance
Acceptance started
Accepted after one cycle of CLKOUT
at the first falling edge of the divided-up DACK
CPU
CPU