ZUSBOPTSC01ZAC datasheet(271/402 Pages) ZILOG

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PS024604-1005

P R E L I M I N A R Y

On-Chip Debugger Commands

Z8FMC16100 Series Flash MCU

Product Specification

249

Write OCD Counter Register.

The Write OCD Counter Register command writes the

data that follows to the OCDCNTR register. If the device is not in DEBUG mode, the data

is discarded.

DBG

← 01h

DBG

← OCDCNTR[15:8]

DBG

← OCDCNTR[7:0]

Read OCD Status Register.

The Read OCD Status Register command reads the OCD-

STAT register.

DBG

← 02h

DBG

→ OCDSTAT[7:0]

Read OCD Counter Register.

The OCD Counter Register can be used to count system

clock cycles in between break points, generate a BRK when it counts down to 0, or gener-

ate a BRK when its value matches the Program Counter. Because this register is really a

down counter, the returned value is inverted when this register is read so the returned

result appears to be an up counter. If the device is not in DEBUG mode, this command

returns FFFFh.

DBG

← 03h

DBG

→ ~OCDCNTR[15:8]

DBG

→ ~OCDCNTR[7:0]

Write OCD Control Register.

The Write OCD Control Register command writes the data

that follows to the OCDCTL register.

DBG

← 04h

DBG

← OCDCTL[7:0]

Read OCD Control Register.

The Read OCD Control Register command reads the value

of the OCDCTL register.

DBG

← 05h

DBG

→ OCDCTL[7:0]

Write Program Counter.

The Write Program Counter command writes the data that fol-

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

the 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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