Z8F1601 Datasheet, PDF (175/246 Pages) Zilog, Inc. – Z8 Encore Microcontrollers with Flash Memory and 10-Bit A/D Converter

Z8F640x/Z8F480x/Z8F320x/Z8F240x/Z8F160x
Z8 Encore!^®
157
Table 93. On-Chip Debugger Commands
Debug Command
Enabled when NOT
Command Byte in Debug mode?
Write Program Memory
0AH
-
Read Program Memory
0BH
-
Write Data Memory
0CH
-
Read Data Memory
0DH
-
Read Program Memory CRC
0EH
-
Reserved
0FH
-
Step Instruction
10H
-
Stuff Instruction
11H
-
Execute Instruction
12H
-
Reserved
13H - 1FH
-
Write Watchpoint
20H
-
Read Watchpoint
21H
-
Reserved
22H - FFH
-
Disabled by
Read Protect Option Bit
Disabled
Disabled
Yes
-
-
-
Disabled
Disabled
Disabled
-
Disabled
-
-
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 is used to
determine the version 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 is
used to read the OCDSTAT register.
DBG <-- 02H
DBG --> OCDSTAT[7:0]
• Read Runtime Counter (03H)—The Runtime Counter is used to count Z8 Encore!
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 Memory, Read Memory, Write Register, Read Register,
Read Memory CRC, Step Instruction, Stuff Instruction, and Execute Instruction
commands.
PS017610-0404
On-Chip Debugger