HCS08 datasheet(256/290 Pages) MOTOROLA

256 / 290 page

Development Support

MC9S08GB/GT

256

MOTOROLA

ARM — Arm Control

Controls whether the debugger is comparing and storing information in the FIFO. A write is used to

set this bit (and the ARMF bit) and completion of a debug run automatically clears it. Any debug run

can be manually stopped by writing 0 to ARM or to DBGEN.

1 = Debugger armed.

0 = Debugger not armed.

TAG — Tag/Force Select

Controls whether break requests to the CPU will be tag or force type requests. If BRKEN = 0, this bit

has no meaning or effect.

1 = CPU breaks requested as tag type requests.

0 = CPU breaks requested as force type requests.

BRKEN — Break Enable

Controls whether a trigger event will generate a break request to the CPU. Trigger events can cause

information to be stored in the FIFO without generating a break request to the CPU. For an end trace,

CPU break requests are issued to the CPU when the comparator(s) and R/W meet the trigger

requirements. For a begin trace, CPU break requests are issued when the FIFO becomes full. TRGSEL

does not affect the timing of CPU break requests.

1 = Triggers cause a break request to the CPU.

0 = CPU break requests not enabled.

RWA — R/W Comparison Value for Comparator A

When RWAEN = 1, this bit determines whether a read or a write access qualifies comparator A. When

RWAEN = 0, RWA and the R/W signal do not affect comparator A.

1 = Comparator A can only match on a read cycle.

0 = Comparator A can only match on a write cycle.

RWAEN — Enable R/W for Comparator A

Controls whether the level of R/W is considered for a comparator A match.

1 = R/W is used in comparison A.

0 = R/W is not used in comparison A.

RWB — R/W Comparison Value for Comparator B

When RWBEN = 1, this bit determines whether a read or a write access qualifies comparator B. When

RWBEN = 0, RWB and the R/W signal do not affect comparator B.

1 = Comparator B can match only on a read cycle.

0 = Comparator B can match only on a write cycle.

RWBEN — Enable R/W for Comparator B

Controls whether the level of R/W is considered for a comparator B match.

1 = R/W is used in comparison B.

0 = R/W is not used in comparison B.

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