20-668-0003 Rabbit Semiconductor, 20-668-0003 Datasheet - Page 218

• Manufacturer Part Number: 20-668-0003
• Description: IC CPU RABBIT2000 30MHZ 100PQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0003

• Processor Type: Rabbit 2000 8-Bit
• Speed: 30MHz
• Voltage: 2.7V, 3V, 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 100-MQFP, 100-PQFP
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 30 MHz
• Operating Supply Voltage: 0 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 40
• Number Of Timers: 8 & 10 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 20-668-0003; 316-1062

The MMIDR register shown in Table B-9 is used to enable and configure separate I & D
space support in addition to the /CS1 enable option used to improve the access time of
battery-backable SRAM.
212
Bit(s)
7:6
5
4
3
2
1
0
NOTE: Bits [7:5] and [3:0] were always written with zero in the original Rabbit 2000 chip.
MMU Instruction/Data Register
Table B-9. MMU Instruction/Data Register (MMIDR = 0x010)
Value
00
0
1
0
1
0
1
0
1
0
1
0
1
These bits are ignored and always return zeros when read.
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. This is 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 DATASEG access: invert A16
Normal operation.
For root access, invert A19 before MBxCR (bank select) decision.
Normal operation.
For root access, invert A16
(MMIDR)
Description
Rabbit 2000 Microprocessor User’s Manual
(Address = 0x10)