
Break Module (BRK)
Functional Description
MC68HC908MR16/MC68HC908MR32
—
Rev. 5.0
Advance Information
MOTOROLA
Break Module (BRK)
363
Figure 21-1. Break Module Block Diagram
IAB15
–
IAB8
IAB7
–
IAB0
8-BIT COMPARATOR
8-BIT COMPARATOR
CONTROL
BREAK ADDRESS REGISTER LOW
BREAK ADDRESS REGISTER HIGH
IAB15
–
IAB0
BREAK
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
$FE00
SIMBreak Status Register
(SBSR)
See page 367.
Read:
R
R
R
R
R
R
BW
R
Write:
Reset:
0
$FE03
SIM Break Flag Control
Register (SBFCR)
See page 368.
Read:
BCFE
R
R
R
R
R
R
R
Write:
Reset:
0
$FE0C
Break Address Register
High (BRKH)
See page 366.
Read:
Bit 15
14
13
12
11
10
9
Bit 8
Write:
Reset:
0
0
0
0
0
0
0
0
$FE0D
Break Address Register
Low (BRKL)
See page 366.
Read:
Bit 7
6
5
4
3
2
1
Bit 0
Write:
Reset:
0
0
0
0
0
0
0
0
$FE0E
Break Status and Control
Register (BRKSCR)
See page 365.
Read:
BRKE
BRKA
0
0
0
0
0
0
Write:
Reset:
0
0
0
0
0
0
0
0
Note: Writing a logic 0 clears BW.
= Unimplemented
R
= Reserved
Figure 21-2. I/O Register Summary