668-0010 Rabbit Semiconductor, 668-0010 Datasheet - Page 57
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: 57 of 312
- Download datasheet (2Mb)
5.3.5 Stack Protection (Rabbit 3000A)
The ability to detect stack overflow and underflow was added starting with the Rabbit
3000A. Low and high stack limits can be set on 256-byte boundaries. When a stack-
relative memory access occurs within 16 bytes of these limits (or outside of them), a new
Priority 3 stack violation interrupt occurs. The 16-byte buffer exists to allow stack protec-
tion even if the stack is placed against a memory segment boundary.
Figure 5-6 shows one possible stack layout. A 2048-byte stack is set up by setting
STKHLR to 0x00E0, STKLLR to 0x00D8, and SP to 0xDFF0. Any stack-relative mem-
ory accesses above 0xDFEF (i.e., stack underflow) or below 0xD810 (i.e., overflow)
would trigger the stack violation interrupt.
Figure 5-6. Simple Stack Protection Layout
5.3.6 RAM Segment Relocation (Rabbit 3000A)
Normally when instruction/data separation is enabled, instructions are stored in flash
memory and data are stored in RAM memory. This can present a problem for the Interrupt
Service Routine area, which often requires run-time modification. The RAM Segment
Register (RAMSR) allows a 1, 2, or 4 KB segment of the logical memory space to be
mapped as data would be mapped, even for program execution.
Chapter 5 Memory Management
47
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