20-668-0003 Rabbit Semiconductor, 20-668-0003 Datasheet - Page 101

• 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

8.3.2 MMU Instruction/Data Register
8.3.2.1 Instruction and Data Space Support
Support for Instruction and Data space (I and D space) support was added in revisions A–C
by optionally inverting address lines A16 and/or A19 when the processor accesses D
space, but not inverting those lines when the processor accesses I space. The MMIDR reg-
ister is used to control this inversion. Refer to Section B.2.5 for more information on using
I and D space on the Rabbit 2000 chip. More information on separate I and D implementa-
tion will be available in the Rabbit 2000 Designer’s Handbook, and is currently available
in the Rabbit 3000 Designers Handbook.
8.3.2.2 /CS1 Enable
The optional enable of /CS1 is valuable for systems that are pushing the access time of
battery-backed RAM. By enabling /CS1, the delay time of the switch that forces /CS1
high when power is off can be bypassed. This feature increases power consumption since
the RAM is always enabled and its access is controlled normally by /OE1. This option is
enabled by setting bit 4 in the MMIDR register. See Section B.2.5 for more information.
8.3.3 Memory Timing Control Register
8.3.3.1 Early Memory Output-Enable Feature
The early I/O enable feature was added to the Rabbit 2000C revision to relax the tight tim-
ing requirements for memory access when using the clock spectrum spreader. See
Section B.2.13 for more information.
Chapter 8 Memory Mapping and Interface
95