Z8F021ASH020SC datasheet(193/276 Pages) ZILOG

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PS022815-0206

On-Chip Debugger

Z8 Encore! XP® 4K Series

Product Specification

174

• Read OCD Revision (00H)—The Read OCD Revision command determines the ver-

sion 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 reads the

OCDSTAT register.

DBG

← 02H

DBG

→ OCDSTAT[7:0]

• Read Runtime Counter (03H)—The Runtime Counter counts 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 Memo-

ry, Read Memory, Write Register, Read Register, Read Memory CRC, Step Instruction,

Stuff Instruction, and Execute Instruction commands.

DBG

← 03H

DBG

→ RuntimeCounter[15:8]

DBG

→ RuntimeCounter[7:0]

• Write OCD Control Register (04H)—The Write OCD Control Register command

writes the data that follows to the OCDCTL register. When the Flash Read Protect Option

Bit is enabled, the DBGMODE bit (OCDCTL[7]) can only be set to 1, it cannot be cleared

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]

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