mc68hc908kx8 Freescale Semiconductor, Inc, mc68hc908kx8 Datasheet - Page 170

• Manufacturer Part Number: mc68hc908kx8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Development Support
16.2.1.2 CPU During Break Interrupts
The CPU starts a break interrupt by:
The break interrupt begins after completion of the CPU instruction in progress. If the break address
register match occurs on the last cycle of a CPU instruction, the break interrupt begins immediately.
170
Note: Writing a 0 clears BW.
$FE00
$FE03
$FE09
$FE0A
$FE0B
$FE02
Addr.
•
•
Loading the instruction register with the SWI instruction
Loading the program counter with $FFFC and $FFFD ($FEFC and $FEFD in monitor mode)
Break Address Register High
Break Address Register Low
SIM Break Status Register
Break Status and Control
Break Auxiliary Register
SIM Break Flag Control
Register Name
Register (BRKSCR)
Register (SBFCR)
See page 172.
See page 173.
See page 172.
See page 172.
See page 171.
See page 173.
IAB15–IAB0
(BRKAR)
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
(BRKH)
(SBSR)
(BRKL)
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Read:
Read:
Read:
Write:
Write:
Write:
Write:
Write:
Write:
Figure 16-1. Break Module Block Diagram
IAB15–IAB8
IAB7–IAB0
Figure 16-2. I/O Register Summary
BRKE
BCFE
Bit 15
Bit 7
Bit 7
BREAK ADDRESS REGISTER HIGH
BREAK ADDRESS REGISTER LOW
R
0
0
0
0
0
0
0
0
8-BIT COMPARATOR
8-BIT COMPARATOR
= Unimplemented
BRKA
14
R
R
6
0
0
0
6
0
0
0
0
13
R
R
5
0
0
0
5
0
0
0
0
0
12
R
R
R
4
1
1
0
4
0
0
0
0
0
CONTROL
= Reserved
11
R
R
3
0
0
0
3
0
0
0
0
0
10
R
R
2
0
0
0
2
0
0
0
0
0
BREAK
Freescale Semiconductor
NOTE
BW
R
1
0
9
0
1
0
0
0
0
0
BDCOP
Bit 0
Bit 8
Bit 0
R
R
0
0
0
0
0
0
0