Z8F021ASH020SC datasheet(192/276 Pages) ZILOG

192 / 276 page

PS022815-0206

On-Chip Debugger

Z8 Encore! XP® 4K Series

Product Specification

173

commands are disabled. Table 109 on page 177 is a summary of the On-chip debugger

commands. Each OCD command is described in further detail in the bulleted list follow-

ing this table. Table 109 also indicates those commands that operate when the device is not

in DEBUG mode (normal operation) and those commands that are disabled by program-

ming the Flash Read Protect Option bit.

In the following bulleted list of OCD Commands, data and commands sent from the host

to the On-Chip Debugger are identified by ’DBG ← Command/Data’. Data sent from the

On-Chip Debugger back to the host is identified by ’DBG → Data’

Debug Command

Command

Byte

Enabled when NOT

in DEBUG mode?

Disabled by

Flash Read Protect Option Bit

Read OCD Revision

00H

Yes

–

Reserved

01H

–

Read OCD Status Register

02H

Yes

–

Read Runtime Counter

03H

–

Write OCD Control Register

04H

Yes

Cannot clear DBGMODE bit

Read OCD Control Register

05H

Yes

–

Write Program Counter

06H

–

Disabled

Read Program Counter

07H

–

Disabled

Write Register

08H

–

Only writes of the Flash Memory Control

registers are allowed. Additionally, only

the Mass Erase command is allowed to

be written to the Flash Control register.

Read Register

09H

–

Disabled

Write Program Memory

0AH

–

Disabled

Read Program Memory

0BH

–

Disabled

Write Data Memory

0CH

–

Yes

Read Data Memory

0DH

–

Read Program Memory CRC

0EH

–

Reserved

0FH

–

Step Instruction

10H

–

Disabled

Stuff Instruction

11H

–

Disabled

Execute Instruction

12H

–

Disabled

Reserved

13H–FFH

–

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