Z8 Encore! XP® F08xA Series
Product Specification
154
Command Enabled when NOT
Disabled by
Debug Command
Write Data Memory
Read Data Memory
Read Program Memory CRC
Reserved
Byte
in DEBUG mode?
Flash Read Protect Option Bit
0CH
–
–
–
–
–
–
–
–
Yes
0DH
–
0EH
–
0FH
–
Step Instruction
Stuff Instruction
Execute Instruction
Reserved
10H
Disabled
Disabled
Disabled
–
11H
12H
13H–FFH
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 0000Hand 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
PS024705-0405
P R E L I M I N A R Y
On-Chip Debugger
ZILOG [ ZILOG, INC. ]
