NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 49
NS7520B-1-I46
Manufacturer Part Number
NS7520B-1-I46
Description
IC ARM MICROPROCESSOR 177BGA
Manufacturer
Digi International
Series
NET+ARM®r
Specifications of NS7520B-1-I46
Applications
Network Processor
Core Processor
ARM7
Program Memory Type
External Program Memory
Controller Series
-
Ram Size
External
Interface
EBI/EMI, Ethernet, DMA, SPI, UART
Number Of I /o
16
Voltage - Supply
1.4 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
177-LFBGA
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
NS7520B-1-I46
Manufacturer:
Digi International
Quantity:
10 000
Part Number:
NS7520B-1-I46
Manufacturer:
NETARM
Quantity:
20 000
- Current page: 49 of 338
- Download datasheet (2Mb)
Entering and exiting an exception (software action)
The ARM7TDMI performs specific steps when handling exceptions.
Entering an exception
When handling an exception, ARM7TDMI does this:
1
2
3
4
5
Note:
Exiting an exception
On completion, ARM7TDMI does this:
1
2
3
Preserves the address of the next instruction in the appropriate Link register.
–
–
The exception handler does not need to determine from which state the
exception was entered. With an SWI, for example,
returns to the next instruction whether executed in ARM or Thumb state.
Copies the CPSR into the appropriate SPSR.
Forces the CPSR mode bits to a value that depends on the exception.
Forces the PC to fetch the next instruction from the relevant exception vector.
Sets the I (for IRQ interrupts) or F (for FIRQ interrupts) bits to disable interrupts
to prevent unmanageable nesting of exceptions.
Moves the Link register, minus the offset where appropriate, to the PC. The
offset value varies depending on the type of exception.
Copies the SPSR back to the CPSR.
Clears the interrupt disable flags, if they were set on entry.
If the exception has been entered from the ARM state, the address of the
next instruction is copied into the Link register. The address is either
current
"Exception entry/exit by exception type" on page 38.)
If the exception has been entered from Thumb state, the value written into
the Link register is the current PC offset by a value that lets the program
continue from the correct place on return from the exception.
If the processor is in Thumb state when an exception occurs, it
automatically switches into ARM state when the PC is loaded with the
exception vector address.
PC + 4
or
PC + 8
, depending on the exception. (See Table 18:
w w w . d i g i e m b e d d e d . c o m
MOVS PC, R14_SVC
W o r k i n g w i t h t h e C P U
always
3 7
Related parts for NS7520B-1-I46
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
IC ARM MICROPROCESSOR 177BGA
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
IC ARM MICROPROCESSOR 177BGA
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
IC ARM MICROPROCESSOR 177BGA
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
KIT JUMP START ME 9210 NET+OS 7
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
KIT JUMP START ME 9210 LINUX
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
KIT INTEGRATION ME MOD S MODELS
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
KIT DEV SP ADPT NO RAVEN
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
KIT DEV SP ADAPTER
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
DIGI CONNECT 4MB FLASH 8MB RAM
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
12VDC EXT TEMP PWR SUP/NO PLUG
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
IC ARM MICROPROCESSOR 177BGA
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
DIGI CONNECT 4MB FLASH 8MB RAM
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
ME 8MB SDRAM 2MB FLASH SINGLE
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
ME 8MB SDRAM 2MB FLASH SINGLE
Manufacturer:
Digi International
Datasheet:
Part Number:
Description:
MODULE 9P 8MB SDRAM 4MB FLASH
Manufacturer:
Digi International/Maxstream
Datasheet: