Maxim-integrated DS4830 Optical Microcontroller Manual de usuario descargar pdf (Pagina 166)

DS4830 User’s Guide

166

21.3.3 – In-Circuit Debug Control Register (ICDC, M2[1Ah])

Bit

Name

DME

REGE

CMD3

CMD2

CMD1

CMD0

Reset

Access

r = read, s = special

BIT

NAME

DESCRIPTION

DME

Debug Mode Enable (DME). When this bit is cleared to 0, background mode commands may

be executed, but breakpoints are disabled. When this bit is set to 1, breakpoints are enabled

while background mode commands still may be entered. This bit may only be set or cleared

from background debug mode. This bit has no meaning for the ROM code.

Reserved

Reserved. Do not write to this bit.

REGE

Break-On Register Enable. The REGE bit is used to enable the break-on register function.

When REGE bit is set to 1, BP4 and BP5 are used as register breakpoints. A break occurs

when the content of BP4 is matched with the destination address of the current instruction. For

BP5, a break occurs only on a selected data pattern for a selected destination register

addressed by BP5. The data pattern is determined by the contents in the ICDA and ICDD

manner in which BP4, BP5 are used. The DME bit still must be set to a logic 1 for any

breakpoint to occur. This bit has no meaning for the ROM code.

Reserved

Reserved. Do not write to this bit.

3:0

CMD3:0

These bits reflect the current host command in debug mode. These bits are set by the debug

engine and allow the ROM code to determine the course of action

CMD3:0

Action

0000

No operation

0001

Read register

0010

Read data memory

0011

Read stack memory

0100

Write register

0101

Write data memory

1000

Unlock password

1001

Read selected register

Other

Reserved

1 2 ... 161 162 163 164 165 166 167 168 169 170 171 ... 226 227

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Maxim-integrated DS4830 Optical Microcontroller Manual de usuario Pagina 166

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