ZUSBOPTSC01ZAC datasheet(274/402 Pages) ZILOG

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On-Chip Debugger

P R E L I M I N A R Y

PS024604-1005

Z8 Encore!® Motor Control Flash MCUs

Product Specification

252

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.

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 Read

Protect option bit is enabled, the OCD ignores this command.

DBG

← 10h

Stuff Instruction.

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 break point. If

the device is not in DEBUG mode or the Read Protect option bit is enabled, the OCD

ignores this command.

DBG

← 11h

DBG

← opcode[7:0]

Execute Instruction.

The Execute Instruction command allows sending an entire instruc-

tion to be executed to the eZ8 CPU. This command can also step over break points. The

number of bytes to send for the instruction depends on the Op Code. If the device is not in

DEBUG mode or the Read Protect option bit is enabled, the OCD ignores this command

DBG

← 12h

DBG

← 1-5 byte opcode

Read Baud Reload Register.

The Read Baud Reload Register command returns the cur-

rent value in the Baud Reload register.

DBG

← 1Bh

DBG

→ BAUD[15:8]

DBG

→ BAUD[7:0]

OCD Control Register

The OCD Control Register, shown in Table 135, controls the state of the On-Chip Debug-

ger. This register enters or exits DEBUG mode and enables the BRK instruction. It can

also reset the Z8FMC16100 Series Flash MCU.

ZUSBOPTSC01ZAC 数据表(PDF) 274 Page - Zilog, Inc.

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