668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 58

• Manufacturer Part Number: 668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 668-0011

• Rohs Status: RoHS non-compliant
• Processor Type: Rabbit 3000 8-Bit
• Speed: 55.5MHz
• Voltage: 2.5V, 2.7V, 3V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Features: -
• Other names: 316-1043

5.4 Register Descriptions
48
Bit(s)
Bit(s)
* This bit is used only on the Rabbit 3000A and later versions; it is reserved and must be written
7:0
7
6
5
4
3
2
1
0
*
with zero on the Rabbit 3000.
MMU Instruction/Data Register
Stack Segment Register
Value
Value
Write
Read
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Internal I/O addresses are decoded using only the lower eight bits of the internal
I/O address bus. This restricts internal I/O addresses to the range 0x0000–
0x00FF.
Internal I/O addresses are decoded using all 15 bits of the address internal I/O
address bus. This option must be selected to access internal I/O addresses of
0x0100 and higher.
This bit is reserved and must be written with zero.
Enable A16 and A19 inversion independent of instruction/data.
Enable A16 and A19 inversion (controlled by bits 0-3) for data accesses only.
This enables the instruction/data split for the separate I and D space.
Normal /CS1 operation.
Force /CS1 always active. This will not cause any conflicts as long as the
memory using /CS1 does not also share an Output Enable or Write Enable with
another memory.
Normal operation.
For a DATASEG access, invert A19 before MBxCR (bank select) decision.
Normal operation.
For a data segment access: invert A16
Normal operation.
For root access, invert A19 before MBxCR (bank select) decision.
Normal operation.
For a root segment access: invert A16
The current contents of this register are reported.
Eight LSBs (MSBs are set to zero by write) of physical address offset to use if
SEGSIZ[7:4]  Addr[15:12] < 0xE
(STACKSEG)
(MMIDR)
Description
Description
Rabbit 3000 Microprocessor User’s Manual
(Address = 0x0010)
(Address = 0x0011)