Z8F021ASH020SC datasheet(194/276 Pages) ZILOG

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PS022815-0206

On-Chip Debugger

Z8 Encore! XP® 4K Series

Product Specification

175

• 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]

DBG

← Size[7:0]

DBG

→ 1-256 data bytes

• Write Program Memory (0AH)—The Write Program Memory command writes data

to Program Memory. This command is equivalent to the LDC and LDCI instructions. Data

can be written 1–65536 bytes at a time (65536 bytes can be written by setting size to 0).

The on-chip Flash Controller must be written to and unlocked for the programming oper-

ation to occur. If the Flash Controller is not unlocked, the data is discarded. If the device

is not in DEBUG mode or if the Flash Read Protect Option bit is enabled, the data is dis-

carded.

DBG

← 0AH

DBG

← Program Memory Address[15:8]

DBG

← Program Memory Address[7:0]

DBG

← Size[15:8]

DBG

← Size[7:0]

DBG

← 1-65536 data bytes

• Read Program Memory (0BH)—The Read Program Memory command reads data

from Program Memory. This command is equivalent to the LDC and LDCI instructions.

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