AT91SAM7S32-AI ATMEL [ATMEL Corporation], AT91SAM7S32-AI Datasheet - Page 173

• Manufacturer Part Number: AT91SAM7S32-AI
• Description: AT91 ARM Thumb-based Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

Debug Unit (DBGU)
Overview
6071A–ATARM–28-Oct-04
The Debug Unit provides a single entry point from the processor for access to all the debug
capabilities of Atmel’s ARM-based systems.
The Debug Unit features a two-pin UART that can be used for several debug and trace pur-
poses and offers an ideal medium for in-situ programming solutions and debug monitor
communications. Moreover, the association with two peripheral data controller channels per-
mits packet handling for these tasks with processor time reduced to a minimum.
The Debug Unit also makes the Debug Communication Channel (DCC) signals provided by
the In-circuit Emulator of the ARM processor visible to the software. These signals indicate the
status of the DCC read and write registers and generate an interrupt to the ARM processor,
making possible the handling of the DCC under interrupt control.
Chip Identifier registers permit recognition of the device and its revision. These registers
inform as to the sizes and types of the on-chip memories, as well as the set of embedded
peripherals.
Finally, the Debug Unit features a Force NTRST capability that enables the software to decide
whether to prevent access to the system via the In-circuit Emulator. This permits protection of
the code, stored in ROM.
AT91SAM7S32 Preliminary
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