Z8F082ASH020SC datasheet(172/244 Pages) ZILOG

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PS024705-0405

P R E L I M I N A R Y

On-Chip Debugger

Z8 Encore! XP® F08xA Series

Product Specification

154

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’

• Read OCD Revision (00H)—The Read OCD Revision command determines the ver-

sion of the On-Chip Debugger. If OCD commands are added, removed, or changed, this

revision number changes.

DBG

← 00H

DBG

→ OCDRev[15:8] (Major revision number)

DBG

→ OCDRev[7:0] (Minor revision number)

• Read OCD Status Register (02H)—The Read OCD Status Register command reads the

OCDSTAT register.

DBG

← 02H

DBG

→ OCDSTAT[7:0]

• Read Runtime Counter (03H)—The Runtime Counter counts system clock cycles in

between Breakpoints. The 16-bit Runtime Counter counts up from 0000H and stops at the

maximum count of FFFFH. The Runtime Counter is overwritten during the Write Memo-

ry, Read Memory, Write Register, Read Register, Read Memory CRC, Step Instruction,

Stuff Instruction, and Execute Instruction commands.

DBG

← 03H

DBG

→ RuntimeCounter[15:8]

DBG

→ RuntimeCounter[7:0]

• Write OCD Control Register (04H)—The Write OCD Control Register command

writes the data that follows to the OCDCTL register. When the Flash Read Protect Option

Bit is enabled, the DBGMODE bit (OCDCTL[7]) can only be set to 1, it cannot be cleared

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

–

Debug Command

Command

Byte

Enabled when NOT

in DEBUG mode?

Disabled by

Flash Read Protect Option Bit

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