EZ80F91MCU Datasheet, PDF (305/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
286
ZiLOG Debug Interface
Introduction
The ZiLOG Debug Interface (ZDI) provides a built-in debugging interface to the
CPU. ZDI provides basic in-circuit emulation features including:
• Examining and modifying internal registers
• Examining and modifying memory
• Starting and stopping the user program
• Setting program and data break points
• Single-stepping the user program
• Executing user-supplied instructions
• Debugging the final product with the inclusion of one small connector
• Downloading code into SRAM
• C source-level debugging using ZiLOG Developer Studio II (ZDSII)
The above features are built into the silicon. Control is provided via a two-wire
interface that is connected to the ZPAK II emulator. Figure 51 illustrates a typical
setup using a a target board, ZPAK II, and the host PC running ZiLOG Developer
Studio II. Refer to the ZiLOG website for more information on ZPAK II and ZDS II.
ZiLOG
Developer
Studio
ZPAK
Emulator
Target Board
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eZ80
Product
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Figure 51. Typical ZDI Debug Setup
ZDI allows reading and writing of most internal registers without disturbing the
state of the machine. Reads and Writes to memory can occur as fast as the ZDI
PS019209-0504
PRELIMINARY
ZiLOG Debug Interface