HD6417705 Datasheet, PDF (35/739 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

Section 8 Direct Memory Access Controller (DMAC)
Figure 8.1 Block Diagram of DMAC ..................................................................................... 240
Figure 8.2 DMAC Transfer Flowchart ................................................................................... 253
Figure 8.3 Round-Robin Mode .............................................................................................. 258
Figure 8.4 Channel Priority in Round-Robin Mode ................................................................ 259
Figure 8.5 Data Flow of Dual Address Mode ......................................................................... 261
Figure 8.6 Example of DMA Transfer Timing in Dual Mode
(Source: Ordinary Memory, Destination: Ordinary Memory).................................. 262
Figure 8.7 Data Flow in Single Address Mode ....................................................................... 263
Figure 8.8 Example of DMA Transfer Timing in Single Address Mode.................................. 263
Figure 8.9 DMA Transfer Example in Cycle-Steal Normal Mode
(Dual Address, DREQ Low Level Detection)......................................................... 264
Figure 8.10 Example of DMA Transfer in Cycle Steal Intermittent Mode
(Dual Address, DREQ Low Level Detection)....................................................... 265
Figure 8.11 DMA Transfer Example in Burst Mode
(Dual Address, DREQ Low Level Detection)....................................................... 265
Figure 8.12 Bus State when Multiple Channels are Operating................................................. 267
Figure 8.13 Example of DREQ Input Detection in Cycle Steal Mode Edge Detection ............. 267
Figure 8.14 Example of DREQ Input Detection in Cycle Steal Mode Level Detection ............ 268
Figure 8.15 Example of DREQ Input Detection in Burst Mode Edge Detection ...................... 268
Figure 8.16 Example of DREQ Input Detection in Burst Mode Level Detection ..................... 269
Figure 8.17 Example of DMA Transfer End Signal (in Cycle Steal Level Detection) .............. 269
Figure 8.18 BSC Ordinary Memory Access
(No Wait, Idle Cycle 1, Longword Access to 16-Bit Device) ................................ 270
Section 9 Clock Pulse Generator (CPG)
Figure 9.1 Block Diagram of Clock Pulse Generator .............................................................. 272
Figure 9.2 Points for Attention when Using Crystal Resonator ............................................... 283
Figure 9.3 Points for Attention when Using PLL Oscillator Circuit ........................................ 284
Section 10 Watchdog Timer (WDT)
Figure 10.1 Block Diagram of WDT ...................................................................................... 286
Figure 10.2 Writing to WTCNT and WTCSR ........................................................................ 290
Section 11 Power-Down Modes
Figure 11.1 Canceling Standby Mode with STBY Bit in STBCR............................................ 301
Figure 11.2 Power-On Reset STATUS Output ....................................................................... 303
Figure 11.3 Manual Reset STATUS Output ........................................................................... 303
Figure 11.4 Canceling Software Standby by Interrupt STATUS Output.................................. 304
Figure 11.5 Canceling Software Standby by Power-On Reset STATUS Output ...................... 304
Figure 11.6 Canceling Software Standby by Manual Reset STATUS Output .......................... 305
Figure 11.7 Canceling Sleep by Interrupt STATUS Output .................................................... 305
Figure 11.8 Canceling Sleep by Power-On Reset STATUS Output......................................... 306
Figure 11.9 Canceling Sleep by Manual Reset STATUS Output............................................. 306
Rev. 2.00, 09/03, page xxxv of xlvi