668-0010 Rabbit Semiconductor, 668-0010 Datasheet - Page 33
668-0010
Manufacturer Part Number
668-0010
Description
IC MPU RABIT3000 55.5MHZ 128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0010
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
316-1016
- Current page: 33 of 312
- Download datasheet (2Mb)
3. R
B
ESET AND
OOTSTRAP
3.1 Overview
The Rabbit 3000’s /RESET pin initializes everything in the processor except for the real-
time clock registers. If a write cycle is in progress, it waits until the write cycle is com-
pleted to avoid potential memory corruption.
After reset, the Rabbit 3000 checks the state of the SMODE pins. Depending on their
state, it either begins normal operation by fetching instruction bytes from /CS0 and /OE0,
or it enters a special bootstrap mode where it fetches bytes from either Serial Port A or the
slave port. In this mode, bytes can be written to internal registers to set up the Rabbit 3000
for a particular configuration, or to memory to load a program. The processor can begin
normal operation once the bootstrap operation is completed.
3.1.1 Block Diagram
Chapter 3 Reset and Bootstrap
23
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