UPD78F1502AGK-GAK-AX Datasheet, PDF (753/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 18 DMA CONTROLLER
Figure 18-13. Forced Termination of DMA Transfer (2/2)
Example 3
• Procedure for forcibly terminating the DMA
transfer for one channel if both channels are used
• Procedure for forcibly terminating the DMA
transfer for both channels if both channels are used
DWAIT0 = 1
DWAIT1 = 1
DSTn = 0
DWAIT0 = 0
DWAIT1 = 0
DENn = 0
DWAIT0 = 1
DWAIT1 = 1
DST0 = 0
DST1 = 0
DWAIT0 = 0
DWAIT1 = 0
DEN0 = 0
DEN1 = 0
Caution In example 3, the system is not required to wait two clock cycles after the DWAITn bit is set to 1. In
addition, the system does not have to wait two clock cycles after clearing the DSTn bit to 0,
because more than two clock cycles elapse from when the DSTn bit is cleared to 0 to when the
DENn bit is cleared to 0.
Remarks 1. n: DMA channel number (n = 0, 1)
2. 1 clock: 1/fCLK (fCLK: CPU clock)
R01UH0004EJ0501 Rev.5.01
737
Jun 20, 2011