20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 209

• Manufacturer Part Number: 20-668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0011

• 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
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 55.5 MHz
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 55 C
• Number Of Programmable I/os: 56
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 316-1061

24.1 Overview
The Breakpoint/Debug controller allows the RST 28 instruction to be used as a software
breakpoint. Normally the RST 28 instruction causes a call to a particular location in
memory, but the operation of this instruction is modified when the breakpoint/debug
feature is enabled. The RST 28 instruction is treated as a NOP in the breakpoint/debug
mode.
Another breakpoint feature is the ability to disable the RST 28 instruction. The RST 28
vector was often used as a breakpoint feature by adding that instruction to code; by
enabling a bit in BDCR, the RST 28 instruction will execute as a NOP instead, providing
an easy way to disable that type of breakpoint.
24.1.1 Registers
24.2 Dependencies
24.2.1 I/O Pins
There are no I/O pins associated with breakpoints.
24.2.2 Clocks
There are no clocks associated with breakpoints.
24.2.3 Other Registers
There are no other registers associated with breakpoints.
24.2.4 Interrupts
There are no interrupts associated with breakpoints.
Chapter 24 Breakpoints
Breakpoint/Debug Control Register
Register Name
Mnemonic I/O Address R/W
BDCR
24. B
0x001C
REAKPOINTS
W
0xxxxxxx
Rabbit
Reset
3000
00000000
Rabbit
3000A
Reset
199