HCS08 datasheet(274/316 Pages) NXP

274 / 316 page

MC9S08SG8 MCU Series Data Sheet, Rev. 8

274

Freescale Semiconductor

A-Only — Trigger when the address matches the value in comparator A

A OR B — Trigger when the address matches either the value in comparator A or the value in

comparator B

A Then B — Trigger when the address matches the value in comparator B but only after the address for

another cycle matched the value in comparator A. There can be any number of cycles after the A match

and before the B match.

A AND B Data (Full Mode) — This is called a full mode because address, data, and R/W (optionally)

must match within the same bus cycle to cause a trigger event. Comparator A checks address, the low byte

of comparator B checks data, and R/W is checked against RWA if RWAEN = 1. The high-order half of

comparator B is not used.

In full trigger modes it is not useful to specify a tag-type CPU breakpoint (BRKEN = TAG = 1), but if you

do, the comparator B data match is ignored for the purpose of issuing the tag request to the CPU and the

CPU breakpoint is issued when the comparator A address matches.

A AND NOT B Data (Full Mode) — Address must match comparator A, data must not match the low

half of comparator B, and R/W must match RWA if RWAEN = 1. All three conditions must be met within

the same bus cycle to cause a trigger.

In full trigger modes it is not useful to specify a tag-type CPU breakpoint (BRKEN = TAG = 1), but if you

do, the comparator B data match is ignored for the purpose of issuing the tag request to the CPU and the

CPU breakpoint is issued when the comparator A address matches.

Event-Only B (Store Data) — Trigger events occur each time the address matches the value in

comparator B. Trigger events cause the data to be captured into the FIFO. The debug run ends when the

FIFO becomes full.

A Then Event-Only B (Store Data) — After the address has matched the value in comparator A, a trigger

event occurs each time the address matches the value in comparator B. Trigger events cause the data to be

captured into the FIFO. The debug run ends when the FIFO becomes full.

Inside Range (A

 Address  B) — A trigger occurs when the address is greater than or equal to the value

in comparator A and less than or equal to the value in comparator B at the same time.

Outside Range (Address < A or Address > B) — A trigger occurs when the address is either less than

the value in comparator A or greater than the value in comparator B.

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