Z8F082ASJ020EG Datasheet, PDF (207/282 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F082A Series
Product Specification
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DBG ← Size[15:8]
DBG ← Size[7:0]
DBG ← 1-65536 data bytes
Read Data Memory (0DH). The Read Data Memory command reads from Data Memory.
This command is equivalent to the LDE and LDEI instructions. Data can be read 1 to
65536 bytes at a time (65536 bytes can be read by setting size to 0). If the device is not in
DEBUG Mode, this command returns FFH for the data.
DBG ← 0DH
DBG ← Data Memory Address[15:8]
DBG ← Data Memory Address[7:0]
DBG ← Size[15:8]
DBG ← Size[7:0]
DBG → 1-65536 data bytes
Read Program Memory CRC (0EH). The Read Program Memory CRC command com-
putes and returns the Cyclic Redundancy Check (CRC) of Program Memory using the 16-
bit CRC-CCITT polynomial. If the device is not in DEBUG Mode, this command returns
FFFFH for the CRC value. Unlike most other OCD Read commands, there is a delay from
issuing of the command until the OCD returns the data. The OCD reads the Program
Memory, calculates the CRC value and returns the result. The delay is a function of the
Program Memory size and is approximately equal to the system clock period multiplied by
the number of bytes in the Program Memory.
DBG ← 0EH
DBG → CRC[15:8]
DBG → CRC[7:0]
Step Instruction (10H). The Step Instruction command steps one assembly instruction at
the current Program Counter (PC) location. If the device is not in DEBUG Mode or the
Flash Read Protect Option bit is enabled, the OCD ignores this command.
DBG ← 10H
Stuff Instruction (11H). The Stuff Instruction command steps one assembly instruction
and allows specification of the first byte of the instruction. The remaining 0-4 bytes of the
instruction are read from Program Memory. This command is useful for stepping over
instructions where the first byte of the instruction has been overwritten by a Breakpoint. If
the device is not in DEBUG Mode or the Flash Read Protect Option bit is enabled, the
OCD ignores this command.
DBG ← 11H
DBG ← opcode[7:0]
Execute Instruction (12H). The Execute Instruction command allows sending an entire
instruction to be executed to the eZ8 CPU. This command can also step over Breakpoints.
The number of bytes to send for the instruction depends on the opcode. If the device is not
PS022827-1212
PRELIMINARY
On-Chip Debugger Commands