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Download Rabbit ® 3000 Microprocessor User`s Manual
Transcript
The I/O banks on Port E (enabled for the User mode by IBUER) have a slightly different operation in the User mode. Disabling user access to a given I/O bank not only causes writes to the corresponding IBxCR register to be ignored in the User mode, but also inhibits the strobe associated with that I/O bank. Access to the internal I/O registers listed in Table C-4 is always denied in the User mode. Table C-4. I/O Addresses Inaccessible in User Mode Register Name Mnemonic I/O Address GCSR 0x0000 Watchdog Timer Control Register WDTCR 0x0008 Watchdog Timer Test Register WDTTR 0x0009 Global Clock Modulator 0 Register GCM0R 0x000A Global Clock Modulator 1 Register GCM1R 0x000B Secondary Watchdog Timer Register* SWDTR 0x000C Global Power Save Control Register GPSCR 0x000D Global Output Control Register GOCR 0x000E Global Clock Double Register GCDR 0x000F MMIDR 0x0010 Stack Segment Register STACKSEG 0x0011 Data Segment Register DATASEG 0x0012 Segment Size Register SEGSIZE 0x0013 Memory Bank 0 Control Register MB0CR 0x0014 Memory Bank 1 Control Register MB1CR 0x0015 Memory Bank 2 Control Register MB2CR 0x0016 Memory Bank 3 Control Register MB3CR 0x0017 MMU Expanded Code Register MECR 0x0018 Memory Timing Control Register MTCR 0x0019 Breakpoint/Debug Control Register BDCR 0x001C Global Control/Status Register MMU Instruction/Data Register User Enable registers* 0x03xx Memory Protection registers* 0x04xx * These registers are only available on the Rabbit 3000A. 322 Rabbit 3000 Microprocessor User’s Manual
