Microcontroller User's Manual

31-8 MCF5282 User’s Manual MOTOROLA

Functional Description

Figure 31-3. TAP Controller State Machine Flow

31.5.3 JTAG Instructions

Table 31-5 describes public and private instructions.

Table 31-5. JTAG Instructions

Instruction IR[3:0] Instruction Summary

EXTEST 0000 Selects boundary scan register while applying fixed values to output pins and asserting

functional reset

IDCODE 0001 Selects IDCODE register for shift

SAMPLE/PRELOAD 0010 Selects boundary scan register for shifting, sampling, and preloading without

disturbing functional operation

RUN-TEST/IDLE

TEST-LOGIC-RESET

SELECT DR-SCAN

CAPTURE-DR

EXIT1-DR

PAUSE-DR

UPDATE-DR

SELECT IR-SCAN

SHIFT-DR

EXIT2-DR

CAPTURE-IR

SHIFT-IR

EXIT1-IR

PAUSE-IR

EXIT2-IR

UPDATE-IR