MC68HC908MR8 Datasheet, PDF (333/372 Pages) Motorola, Inc – Microcontrollers

Break (BRK)
Low-Power Modes
20.5 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-
consumption standby modes.
20.5.1 Wait Mode
If enabled, the break module is active in wait mode. In the break routine,
the user can subtract one from the return address on the stack if SBSW
is set. Clear the BW bit by writing logic 0 to it.
20.5.2 Stop Mode
A break interrupt causes exit from stop mode and sets the SBSW bit in
the break status register.
20.6 Break Module Registers
These registers control and monitor operation of the break module:
• Break status and control register (BRKSCR)
• Break address register high (BRKH)
• Break address register low (BRKL)
• SIM break status register (SBSR)
• SIM break flag control register (SBFCR)
20.6.1 Break Status and Control Register
The break status and control register (BRKSCR) contains break module
enable and status bits.
Ad-
dress:
$FE0E
Bit 7
6
5
4
3
2
1
Bit 0
Figure 20-3. Break Status and Control Register (BRKSCR)
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
Break (BRK)
Technical Data
333