MCF52223 FREESCALE [Freescale Semiconductor, Inc], MCF52223 Datasheet - Page 10

• Manufacturer Part Number: MCF52223
• Description: Microcontroller Data Sheet
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

MCF52223 Family Configurations
1.2.3
The MCF52223 supports circuit board test strategies based on the Test Technology Committee of IEEE
and the Joint Test Action Group (JTAG). The test logic includes a test access port (TAP) consisting of a
16-state controller, an instruction register, and three test registers (a 1-bit bypass register, a 256-bit
boundary-scan register, and a 32-bit ID register). The boundary scan register links the device’s pins into
one shift register. Test logic, implemented using static logic design, is independent of the device system
logic.
The MCF52223 implementation can do the following:
1.2.4
1.2.4.1
The SRAM module provides a general-purpose 32-Kbyte memory block that the ColdFire core can access
in a single cycle. The location of the memory block can be set to any 32-Kbyte boundary within the
4-Gbyte address space. This memory is ideal for storing critical code or data structures and for use as the
system stack. Because the SRAM module is physically connected to the processor's high-speed local bus,
it can quickly service core-initiated accesses or memory-referencing commands from the debug module.
The SRAM module is also accessible by the DMA. The dual-ported nature of the SRAM makes it ideal
for implementing applications with double-buffer schemes, where the processor and a DMA device
operate in alternate regions of the SRAM to maximize system performance.
1.2.4.2
The ColdFire Flash module (CFM) is a non-volatile memory (NVM) module that connects to the
processor’s high-speed local bus. The CFM is constructed with four banks of 32K x 16-bit Flash arrays to
generate 256 Kbytes of 32-bit Flash memory. These arrays serve as electrically erasable and
programmable, non-volatile program and data memory. The Flash memory is ideal for program and data
storage for single-chip applications, allowing for field reprogramming without requiring an external high
voltage source. The CFM interfaces to the ColdFire core through an optimized read-only memory
controller which supports interleaved accesses from the 2-cycle Flash arrays. A backdoor mapping of the
Flash memory is used for all program, erase, and verify operations, as well as providing a read datapath
for the DMA. Flash memory may also be programmed via the EzPort, which is a serial Flash programming
interface that allows the Flash to be read, erased and programmed by an external controller in a format
compatible with most SPI bus Flash memory chips.
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Perform boundary-scan operations to test circuit board electrical continuity
Sample MCF52223 system pins during operation and transparently shift out the result in the
boundary scan register
Bypass the MCF52223 for a given circuit board test by effectively reducing the boundary-scan
register to a single bit
Disable the output drive to pins during circuit-board testing
Drive output pins to stable levels
JTAG
On-Chip Memories
SRAM
Flash
MCF52223 ColdFire® Microcontroller Data Sheet, Rev. 1
Preliminary
Freescale Semiconductor