Datasheet

Break Module (BRK)
MC68HC908LJ12 — Rev. 2.1 Technical Data
Freescale Semiconductor Break Module (BRK) 385
Figure 22-1. 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 7654321Bit 0
$FE00
SIM Break Status Register
(SBSR)
Read:
RRRRRR
SBSW
R
Write: Note
Reset: 0
$FE03
SIM Break Flag Control
Register
(SBFCR)
Read:
BCFERRRRRRR
Write:
Reset: 0
$FE0C
Break Address
Register High
(BRKH)
Read:
Bit 15 14 13 12 11 10 9 Bit 8
Write:
Reset:00000000
$FE0D
Break Address
Register Low
(BRKL)
Read:
Bit 7654321Bit 0
Write:
Reset:00000000
$FE0E
Break Status and Control
Register
(BRKSCR)
Read:
BRKE BRKA
000000
Write:
Reset:00000000
Note: Writing a logic 0 clears SBSW.
= Unimplemented R = Reserved
Figure 22-2. Break Module I/O Register Summary