參數(shù)資料
型號: MCF5270
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: 32-bit Embedded Controller Division
中文描述: 32位嵌入式控制器部
文件頁數(shù): 7/56頁
文件大小: 1096K
代理商: MCF5270
Features
MCF5271 Integrated Microprocessor Hardware Specification, Rev. 1.2
Freescale Semiconductor
7
— Reset
– Separate reset in and reset out signals
– Six sources of reset: Power-on reset (POR), External, Software, Watchdog, PLL loss of
clock, PLL loss of lock
– Status flag indication of source of last reset
General Purpose I/O interface
— Up to 61 bits of general purpose I/O
— Bit manipulation supported via set/clear functions
— Unused peripheral pins may be used as extra GPIO
JTAG support for system level board testing
3.2
V2 Core Overview
The processor core is comprised of two separate pipelines that are decoupled by an instruction buffer. The
two-stage Instruction Fetch Pipeline (IFP) is responsible for instruction-address generation and instruction
fetch. The instruction buffer is a first-in-first-out (FIFO) buffer that holds prefetched instructions awaiting
execution in the Operand Execution Pipeline (OEP). The OEP includes two pipeline stages. The first stage
decodes instructions and selects operands (DSOC); the second stage (AGEX) performs instruction
execution and calculates operand effective addresses, if needed.
The V2 core implements the ColdFire Instruction Set Architecture Revision A with added support for a
separate user stack pointer register and four new instructions to assist in bit processing. Additionally, the
MCF5271 core includes the enhanced multiply-accumulate unit (EMAC) for improved signal processing
capabilities. The EMAC implements a 4-stage execution pipeline, optimized for 32 x 32 bit operations,
with support for four 48-bit accumulators. Supported operands include 16- and 32-bit signed and unsigned
integers as well as signed fractional operands as well as a complete set of instructions to process these data
types. The EMAC provides superb support for execution of DSP operations within the context of a single
processor at a minimal hardware cost.
3.3
Debug Module
The ColdFire processor core debug interface is provided to support system debugging in conjunction with
low-cost debug and emulator development tools. Through a standard debug interface, users can access
real-time trace and debug information. This allows the processor and system to be debugged at full speed
without the need for costly in-circuit emulators. The debug interface is a superset of the BDM interface
provided on Freescale’s 683xx family of parts.
The on-chip breakpoint resources include a total of 6 programmable registers—a set of address registers
(with two 32-bit registers), a set of data registers (with a 32-bit data register plus a 32-bit data mask
register), and one 32-bit PC register plus a 32-bit PC mask register. These registers can be accessed through
the dedicated debug serial communication channel or from the processor’s supervisor mode programming
model. The breakpoint registers can be configured to generate triggers by combining the address, data, and
PC conditions in a variety of single or dual-level definitions. The trigger event can be programmed to
generate a processor halt or initiate a debug interrupt exception.
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