20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 233

• 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

Some sample code for both System Mode interrupts and User Mode interrupts is shown
below. The use of SETUSRP and SETSYSP provides checks against stack mismatches and
incorrect System/User Modes coming out of the User Mode handler.
Chapter 26 System/User Mode
systemmode_isr:
usermode_isr:
sures
ipres
ret
push su
setusrp 0x1234
call user_handler
setsysp 0x1234
sures
ipres
ret
... handle interrupt ...
; jumped to from interrupt vector table
; reenter previous mode
; restore previous interrupt priority
; jumped to from interrupt vector table
;
; preserve current SU stack
; enter user mode with stack compare value
; handle interrupt at user level
; return to system mode
; reenter previous mode
; restore previous interrupt priority
(still in system mode at this point)
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