Freescale Semiconductor ColdFire MCF52210 - Manual (Page 25)

Overview
MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 1-9
real-time tracing capability is provided on 100-lead packages. This allows the processor and system to be
debugged at full speed without the need for costly in-circuit emulators.
The on-chip breakpoint resources include a total of nine programmable 32-bit registers: an address and an
address mask register, a data and a data mask register, four PC registers, and one 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.
The MCF52211 implements revision B+ of the ColdFire Debug Architecture.
The MCF52211’s interrupt servicing options during emulator mode allow real-time critical interrupt
service routines to be serviced while processing a debug interrupt event. This ensures the system continues
to operate even during debugging.
To support program trace, the V2 debug module provides processor status (PST[3:0]) and debug data
(DDATA[3:0]) ports. These buses and the PSTCLK output provide execution status, captured operand
data, and branch target addresses defining processor activity at the CPU’s clock rate. The MCF52211
includes a new debug signal, ALLPST. This signal is the logical AND of the processor status (PST[3:0])
signals and is useful for detecting when the processor is in a halted state (PST[3:0] = 1111).
The full debug/trace interface is available only on the 100-pin packages. However, every product features
the dedicated debug serial communication channel (DSI, DSO, DSCLK) and the ALLPST signal.
1.2.3 JTAG
The MCF52211 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 MCF52211 implementation can:
• Perform boundary-scan operations to test circuit board electrical continuity
• Sample MCF52211 system pins during operation and transparently shift out the result in the
boundary scan register
• Bypass the MCF52211 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