MAC7200 datasheet(933/976 Pages) FREESCALE

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MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

855

Chapter 35

Test Controller (PTI)

35.1

Test Controller Introduction

The MAC72xx Test Controller (PTI) performs the following tasks:

•

Implementation of JTAG Test Register 4

•

Control of Lockout Recovery sequence

35.1.1

JTAG Test Register (SC4)

The SC4 Test Register is directly accessible from the JTAG interface, and includes the following

functionality:

•

JTAG Lockout Recovery

•

Device ID

•

Debug Reset

•

Chip Status

•

Core Run Control

•

This register is customer visible

The SC4 Test Register can be accessed as follows:

Perform a JTAG SCAN_N instruction with the following values:

—ID Number = 4

— Register Length = 23 bits

— For writes to SC4, the WRITE bit (bit 22) must be set.

— For reads from SC4, the WRITE bit (bit 22) must be cleared.

The SC4 Test Register contains the following bits:

Table 35-1. SC4 Test Register Field Definitions

Field

Reset

Value

Function

Core is running

4:1

n/a

Device ID (Read only)

Reset debug logic

7:6

(reserved)

n/a

Flash Lockout Recovery is complete (Read only)

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