Z8F082ASH020SC datasheet(173/244 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

155

to 0 and the only method of returning the device to normal operating mode is to reset the

device.

DBG

← 04H

DBG

← OCDCTL[7:0]

• Read OCD Control Register (05H)—The Read OCD Control Register command reads

the value of the OCDCTL register.

DBG

← 05H

DBG

→ OCDCTL[7:0]

• Write Program Counter (06H)—The Write Program Counter command writes the data

that follows to the eZ8 CPU’s Program Counter (PC). If the device is not in DEBUG mode

or if the Flash Read Protect Option bit is enabled, the Program Counter (PC) values are

discarded.

DBG

← 06H

DBG

← ProgramCounter[15:8]

DBG

← ProgramCounter[7:0]

• Read Program Counter (07H)—The Read Program Counter command reads the value

in the eZ8 CPU’s Program Counter (PC). If the device is not in DEBUG mode or if the

Flash Read Protect Option bit is enabled, this command returns FFFFH.

DBG

← 07H

DBG

→ ProgramCounter[15:8]

DBG

→ ProgramCounter[7:0]

• Write Register (08H)—The Write Register command writes data to the Register File.

Data can be written 1–256 bytes at a time (256 bytes can be written by setting size to 0). If

the device is not in DEBUG mode, the address and data values are discarded. If the Flash

Read Protect Option bit is enabled, only writes to the Flash Control Registers are allowed

and all other register write data values are discarded.

DBG

← 08H

DBG

← {4’h0,Register Address[11:8]}

DBG

← Register Address[7:0]

DBG

← Size[7:0]

DBG

← 1-256 data bytes

• Read Register (09H)—The Read Register command reads data from the Register File.

Data can be read 1–256 bytes at a time (256 bytes can be read by setting size to 0). If the

device is not in DEBUG mode or if the Flash Read Protect Option bit is enabled, this com-

mand returns FFH for all the data values.

DBG

← 09H

DBG

← {4’h0,Register Address[11:8]

DBG

← Register Address[7:0]

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