z8f083a ZiLOG Semiconductor, z8f083a Datasheet - Page 150

• Manufacturer Part Number: z8f083a
• Description: High-performance 8-bit Microcontrollers
• Manufacturer: ZiLOG Semiconductor

On-Chip Debugger Commands
PS026308-1207
Debug Command
Read OCD Revision
Reserved
Read OCD Status Register
Read Runtime Counter
Write OCD Control Register
Read OCD Control Register
Write Program Counter
Read Program Counter
Write Register
Read Register
Write Program Memory
Read Program Memory
Write Data Memory
Read Data Memory
Read Program Memory CRC
Reserved
Step Instruction
Stuff Instruction
The host communicates to the On-Chip Debugger by sending OCD commands using the
DBG interface. During normal operation, only a subset of the OCD commands are
available. In DEBUG mode, all OCD commands become available unless the user code
and control registers are protected by programming the Flash read protect option bit
(FRP). The FRP prevents the code in memory from being read out of the Z8 Encore!
F083A Series products. When this option is enabled, several of the OCD commands are
disabled. The table below is a summary of the On-Chip Debugger commands. This table
indicates the commands that operate when the device is not in DEBUG mode (normal
operation) and the commands that are disabled by programming the FRP.
Command
Byte
0CH
0DH
0AH
0BH
0EH
0FH
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
10H
11H
NOT in DEBUG
Enabled when
mode?
Yes
Yes
Yes
Yes
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Only writes of the Flash Memory Control
the Mass Erase command is allowed to
registers are allowed. Additionally, only
be written to the Flash Control register.
Flash Read Protect Option Bit
Cannot clear DBGMODE bit
Z8 Encore!
Disabled by
Product Specification
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Disabled
Yes
–
–
–
–
–
–
–
–
®
On-Chip Debugger
F083A Series
138