Datasheet

MC68HC908LJ24/LK24 — Rev. 2.1 Data Sheet
Freescale Semiconductor Break Module (BRK) 427
Data Sheet — MC68HC908LJ24
Section 23. Break Module (BRK)
23.1 Contents
23.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .427
23.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .428
23.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .428
23.4.1 Flag Protection During Break Interrupts. . . . . . . . . . . . . . .430
23.4.2 CPU During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . .430
23.4.3 TIM1 and TIM2 During Break Interrupts. . . . . . . . . . . . . . .430
23.4.4 COP During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . .430
23.5 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .430
23.5.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .430
23.5.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .431
23.6 Break Module Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .431
23.6.1 Break Status and Control Register. . . . . . . . . . . . . . . . . . .431
23.6.2 Break Address Registers . . . . . . . . . . . . . . . . . . . . . . . . . .432
23.6.3 SIM Break Status Register. . . . . . . . . . . . . . . . . . . . . . . . .432
23.6.4 SIM Break Flag Control Register . . . . . . . . . . . . . . . . . . . .434
23.2 Introduction
This section describes the break module. The break module can
generate a break interrupt that stops normal program flow at a defined
address to enter a background program.