MC908JL3ECPE Datasheet, PDF (132/180 Pages) Freescale Semiconductor, Inc – Microcontrollers

Break Module (BREAK)
15.4.2 Break Address Registers
The break address registers contain the high and low bytes of the desired breakpoint address. Reset
clears the break address registers.
Address: $FE0C
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 15
14
13
12
11
10
Write:
9
Bit 8
Reset: 0
0
0
0
0
0
0
0
Figure 15-4. Break Address Register High (BRKH)
Address: $FE0D
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
6
5
4
3
2
1
Bit 0
Write:
Reset: 0
0
0
0
0
0
0
0
Figure 15-5. Break Address Register Low (BRKL)
15.4.3 Break Status Register
The break status register contains a flag to indicate that a break caused an exit from wait mode.
Address: $FE00
Bit 7
6
5
4
3
2
1
Bit 0
Read:
SBSW
R
Write:
R
R
R
R
R
Note⁽¹⁾
R
Reset:
0
R = Reserved
1. Writing a zero clears SBSW.
Figure 15-6. 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
MC68HC908JL3E Family Data Sheet, Rev. 4
132
Freescale Semiconductor