MCF5270CAB100 Freescale Semiconductor, MCF5270CAB100 Datasheet - Page 252
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MCF5270CAB100
Manufacturer Part Number
MCF5270CAB100
Description
MCU V2 COLDFIRE 64K SRAM 160-QFP
Manufacturer
Freescale Semiconductor
Series
MCF527xr
Specifications of MCF5270CAB100
Core Processor
Coldfire V2
Core Size
32-Bit
Speed
100MHz
Connectivity
EBI/EMI, Ethernet, I²C, SPI, UART/USART
Peripherals
DMA, WDT
Number Of I /o
39
Program Memory Type
ROMless
Ram Size
64K x 8
Voltage - Supply (vcc/vdd)
1.4 V ~ 1.6 V
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
160-QFP
Processor Series
MCF527x
Core
ColdFire V2
3rd Party Development Tools
JLINK-CF-BDM26, EWCF
Development Tools By Supplier
NNDK-MOD5272-KIT, NNDK-MOD5270-KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
Data Converters
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCF5270CAB100
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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Interrupt Controller Modules
13.1.2.3 Interrupt Vector Determination
Once the core has sampled for pending interrupts and begun interrupt exception processing, it
generates an interrupt acknowledge cycle (IACK). The IACK transfer is treated as a
memory-mapped byte read by the processor, and routed to the appropriate interrupt controller.
Next, the interrupt controller extracts the level being acknowledged from address bits[4:2], and
then determines the highest priority interrupt request active for that level, and returns the 8-bit
interrupt vector for that request to complete the cycle. The 8-bit interrupt vector is formed using
the following algorithm:
For INTC0,
Recall vector_numbers 0 - 63 are reserved for the ColdFire processor and its internal exceptions.
Thus, the following mapping of bit positions to vector numbers applies for the INTC0:
if interrupt source 1 is active and acknowledged,then vector_number =
if interrupt source 2 is active and acknowledged,then vector_number =
...
if interrupt source 8 is active and acknowledged,then vector_number =
if interrupt source 9 is active and acknowledged,then vector_number =
...
if interrupt source 62 is active and acknowledged,then vector_number = 126
The net effect is a fixed mapping between the bit position within the source to the actual interrupt
vector number.
If there is no active interrupt source for the given level, a special “spurious interrupt” vector
(vector_number = 24) is returned and it is the responsibility of the service routine to handle this
error situation.
Note this protocol implies the interrupting peripheral is not accessed during the acknowledge cycle
since the interrupt controller completely services the acknowledge. This means the interrupt
source must be explicitly disabled in the interrupt service routine. This design provides unique
vector capability for all interrupt requests, regardless of the “complexity” of the peripheral device.
13.2
The register programming model for the interrupt controllers is memory-mapped to a 256-byte
space. In the following discussion, there are a number of program-visible registers greater than 32
bits in size. For these control fields, the physical register is partitioned into two 32-bit values: a
register “high” (the upper longword) and a register “low” (the lower longword). The nomenclature
<reg_name>H and <reg_name>L is used to reference these values.
13-4
Memory Map/Register Definition
vector_number = 64 + interrupt source number
MCF5271 Reference Manual, Rev. 2
Freescale Semiconductor
65
66
72
73
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