MC68HC908GZ8 Datasheet, PDF (81/344 Pages) Motorola, Inc – Microcontrollers

Break Module (BRK)
Break Module Registers
6.4.2 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: $FE09
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write: ^{Bit 15}
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Reset:
0
0
0
0
0
0
0
0
Figure 6-4. Break Address Register High (BRKH)
Address: $FE0A
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write: ^{Bit 7}
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset:
0
0
0
0
0
0
0
0
Figure 6-5. Break Address Register Low (BRKL)
6.4.3 Break Status Register
The break status register (BSR) contains a flag to indicate that a break caused an
exit from wait mode. This register is only used in emulation mode.
Address: $FE00
Bit 7
6
5
Read:
Write:
R
R
R
Reset:
R = Reserved
4
3
2
1
Bit 0
SBSW
R
R
R
Note⁽¹⁾
R
0
1. Writing a logic 0 clears SBSW.
Figure 6-6. Break Status Register (BSR)
SBSW — SIM Break Stop/Wait
SBSW can be read within the break state SWI routine. The user can modify the
return address on the stack by subtracting one from it.
1 = Wait mode was exited by break interrupt
0 = Wait mode was not exited by break interrupt
MC68HC908GZ8
Freescale Semiconductor
Break Module (BRK)
Data Sheet
81