20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 229
20-668-0011
Manufacturer Part Number
20-668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
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
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Manufacturer
Quantity
Price
Company:
Part Number:
20-668-0011
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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Figure 26-3 shows an overview of this level of operation.
26.3.4 Enabling the System/User Mode
The following steps describe how to enable the System/User Mode.
1. If a peripheral needs to be accessed while in User Mode, write to the appropriate user
2. Write a 1 to bit 0 of EDMR to enable System/User Mode.
3. Execute the SETUSR instruction to enter User Mode.
After the User Mode is entered, the limitations described earlier are in effect — writes to
protected registers will be ignored, Priority 3 is not available, and executing an IDET will
cause a System Mode Violation interrupt. Other features such as write protection may be
in effect for the User Mode as well.
Chapter 26 System/User Mode
enable register to allow that access.
Figure 26-3. System/User Mode Setup for Operating System
System Mode
SYSCALL
Flash file
Interrupt
handlers
handler
system
Return from interrupts
SYSCALL, RST
Interrupts,
User Mode
User-defined
Application
interrupts
code
219
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