Datasheet

Break Module (BREAK)
Functional Description
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3 Technical Data
Freescale Semiconductor Break Module (BREAK) 247
Figure 17-1. Break Module Block Diagram
IAB[15:8]
IAB[7:0]
8-BIT COMPARATOR
8-BIT COMPARATOR
CONTROL
BREAK ADDRESS REGISTER LOW
BREAK ADDRESS REGISTER HIGH
IAB[15:0]
BKPT
(TO SIM)
Addr.Register Name Bit 7654321Bit 0
$FE00 Break Status Register
(BSR)
Read:
RRRRRR
SBSW
R
Write: See note
Reset: 0
$FE03 Break Flag Control
Register
(BFCR)
Read:
BCFERRRRRRR
Write:
Reset: 0
$FE0C Break Address High
Register
(BRKH)
Read:
Bit15 Bit14 Bit13 Bit12 Bit11 Bit10 Bit9 Bit8
Write:
Reset:00000000
$FE0D Break Address low
Register
(BRKL)
Read:
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
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 17-2. Break I/O Register Summary