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M68HC08 Datasheet(PDF) 93 Page - Motorola, Inc

Part # M68HC08
Description  Microcontrollers
PDF  408 Pages
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

M68HC08 Datasheet(HTML) 93 Page - Motorola, Inc

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Break Module (BRK)
Functional Description
MC68HC908GR8 — Rev 4.0
Technical Data
MOTOROLA
Break Module (BRK)
93
6.4.1 Flag Protection During Break Interrupts
The BCFE bit in the SIM break flag control register (SBFCR) enables
software to clear status bits during the break state.
6.4.2 CPU During Break Interrupts
The CPU starts a break interrupt by:
•
Loading the instruction register with the SWI instruction
•
Loading the program counter with $FFFC and $FFFD ($FEFC and
$FEFD in monitor mode)
Addr.
Register Name
Bit 7
654321
Bit 0
$FE00
SIM Break Status Register
(SBSR)
Read:
000100
BW
0
Write:
RRRRRR
NOTE
R
Reset:
00010000
$FE03
SIM Break Flag Control
Register (SBFCR)
Read:
BCFE
RRRRRRR
Write:
Reset:
0
$FE09
Break Address Register
High (BRKH)
Read:
Bit 15
14
13
12
11
10
9
Bit 8
Write:
Reset:
00000000
$FE0A
Break Address Register
Low (BRKL)
Read:
Bit 7
654321
Bit 0
Write:
Reset:
00000000
$FE0B
Break Status and Control
Register (BRKSCR)
Read:
BRKE
BRKA
000000
Write:
Reset:
00000000
Note: Writing a logic 0 clears BW.
= Unimplemented
R
= Reserved
Figure 6-2. I/O Register Summary
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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