Contents-7
12.3.4. External Memory Space Access for All Banks ............................................................12-37
12.3.4.1. Off Time Control ...................................................................................................12-37
12.3.4.2. Store Buffer............................................................................................................12-38
12.3.5. Accessing Bank 0 Internal Memory Space ..................................................................12-39
12.4. Bus Arbitration..................................................................................................................12-40
12.4.1. Bus Access Priority......................................................................................................12-40
12.4.2. Requesting and obtaining Access to External Bus..................................................... -12-40
12.4.3. Bus Lock Operation.....................................................................................................12-42
12.5. Standby Modes..................................................................................................................12-43
12.5.1. Shifting to HALT Mode ..............................................................................................12-43
12.5.2. Shifting to STOP Mode ...............................................................................................12-43
12.6. Connecting External Memory ...........................................................................................12-44
12.6.1. Connecting ROM.........................................................................................................12-44
12.6.2. Connecting SRAM.......................................................................................................12-46
12.6.3. Connecting DRAM ......................................................................................................12-48
Chapter 13 Electrical Characteristics
13.1. Absolute Maximum Ratings .................................................................................................13-2
13.2. Recommended Operating Conditions...................................................................................13-2
13.3. DC Characteristics................................................................................................................13-3
13.4. AC Characteristics................................................................................................................13-4
13.4.1. Clock Timing ..................................................................................................................13-4
13.4.2. Control Signal Timing.....................................................................................................13-4
13.4.3. External Bus Timing .......................................................................................................13-5
13.5. Timing Diagram ...................................................................................................................13-6
13.5.1. Clock Timing ..................................................................................................................13-6
13.5.2. Control Signal Timing.....................................................................................................13-7
13.5.3. DMA Timing...................................................................................................................13-8
13.5.4. nXWAIT Signal Input Timing ........................................................................................13-8
13.5.5. External Bus Release Timing ..........................................................................................13-9
13.5.6. Bank 0, 1 Write Cycle...................................................................................................13-10
13.5.7. Bank 0, 1 Read Cycle....................................................................................................13-11
13.5.8. Bank 2, 3 Write Cycle...................................................................................................13-12
13.5.9. Bank 2, 3 Read Cycle....................................................................................................13-13
13.5.10. CAS Before RAS (CBR) Refresh................................................................................13-13
13.5.11. Self-Refresh.................................................................................................................13-14
Appendix
A. List of Control Registers........................................................................................................... A-2
B. Sample Circuits......................................................................................................................... A-8
B.1. Crystal Oscillation circuit..................................................................................................... A-8
B.2. USB Interface Circuit........................................................................................................... A-9
B.3. JTAG Interface Circuit....................................................................................................... A-10
C. Package Dimensions............................................................................................................... A-11