mc68hc908gr16 Freescale Semiconductor, Inc, mc68hc908gr16 Datasheet - Page 238

• Manufacturer Part Number: mc68hc908gr16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Development Support
19.2.1.1 Flag Protection During Break Interrupts
The system integration module (SIM) controls whether or not module status bits can be cleared during
the break state. The BCFE bit in the break flag control register (BFCR) enables software to clear status
bits during the break state. See
for each module.
238
1. Writing a 0 clears SBSW.
$FE00
$FE02
$FE03
$FE09
$FE0A
$FE0B
Addr.
Break Status and Control
Break Auxiliary Register
Register Name
Break Status Register
Break Address High
Register (BRKSCR)
Break Address Low
Break Flag Control
ADDRESS BUS[15:0]
Register (BFCR)
Register (BRKH)
Register (BRKL)
See page 241.
See page 240.
See page 241.
See page 240.
See page 240.
See page 239.
(BRKAR)
(BSR)
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Read:
Read:
Read:
Write:
Write:
Write:
Write:
Write:
Write:
Figure 19-1. Break Module Block Diagram
Figure 19-2. Break I/O Register Summary
ADDRESS BUS[15:8]
ADDRESS BUS[7:0]
15.7.3 Break Flag Control Register
BRKE
BCFE
MC68HC908GR16 Data Sheet, Rev. 5.0
Bit15
Bit 7
Bit 7
Bit 7
R
0
0
0
0
0
BREAK ADDRESS REGISTER HIGH
BREAK ADDRESS REGISTER LOW
8-BIT COMPARATOR
8-BIT COMPARATOR
= Unimplemented
BRKA
Bit14
Bit 6
Bit 6
R
R
6
0
0
0
0
Bit13
Bit 5
Bit 5
R
R
5
0
0
0
0
0
Bit12
Bit 4
Bit 4
R
R
R
4
0
0
0
0
0
and the Break Interrupts subsection
= Reserved
CONTROL
Bit11
Bit 3
Bit 3
R
R
3
0
0
0
0
0
Bit10
Bit 2
Bit 2
R
R
2
0
0
0
0
0
Freescale Semiconductor
BKPT
(TO SIM)
Note
SBSW
Bit 1
Bit 1
Bit9
R
1
0
0
0
0
0
0
(1)
Bit 0
Bit 0
Bit 0
Bit8
R
R
0
0
0
0
0