Jameco Electronics 3000 ユーザーズマニュアル

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 inhib-
its 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.

Global Control/Status Register

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

*

* These registers are only available on the Rabbit 3000A.

SWDTR

0x000C

Global Power Save Control Register

GPSCR

0x000D

Global Output Control Register

GOCR

0x000E

Global Clock Double Register

GCDR

0x000F

MMU Instruction/Data Register

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

User Enable registers

0x03xx

Memory Protection registers

0x04xx