MC908QT4MPE datasheet(136/184 Pages) FREESCALE

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MC68HC908QY/QT Family Data Sheet, Rev. 5

136

Freescale Semiconductor

15.2.2.1 Break Status and Control Register

The break status and control register (BRKSCR) contains break module enable and status bits.

BRKE — Break Enable Bit

This read/write bit enables breaks on break address register matches. Clear BRKE by writing a 0 to

bit 7. Reset clears the BRKE bit.

1 = Breaks enabled on 16-bit address match

0 = Breaks disabled

BRKA — Break Active Bit

This read/write status and control bit is set when a break address match occurs. Writing a 1 to BRKA

generates a break interrupt. Clear BRKA by writing a 0 to it before exiting the break routine. Reset

clears the BRKA bit.

1 = Break address match

0 = No break address match

15.2.2.2 Break Address Registers

The break address registers (BRKH and BRKL) contain the high and low bytes of the desired breakpoint

address. Reset clears the break address registers.

Address: $FE0B

Bit 7

654321

Bit 0

Read:

BRKE

BRKA

000000

Write:

Reset:

00000000

= Unimplemented

Figure 15-3. Break Status and Control Register (BRKSCR)

Address: $FE09

Bit 7

654321

Bit 0

Read:

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Write:

Reset:

00000000

Figure 15-4. Break Address Register High (BRKH)

Address: $FE0A

Bit 7

654321

Bit 0

Read:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Write:

Reset:

00000000

Figure 15-5. Break Address Register Low (BRKL)

MC908QT4MPE Datasheet(PDF) 136 Page - Freescale Semiconductor, Inc

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