Ad va nc e Inform a tion — MC68HC(9)08PT48
Se c tion 21. Ale rt Outp ut Ge ne ra tor (ALR)
21.1 Conte nts
21.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .325
21.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .325
21.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .326
21.4.1
21.4.2
21.4.3
Alert Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .327
Sound Pressure Level Circuit . . . . . . . . . . . . . . . . . . . . . .328
Alert Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .329
21.2 Introd uc tion
21.3 Fe a ture s
This section describes the alert output generator (ALR), which provides
14 software selectable square-wave output frequencies.
Features of the ALR module include:
• 14 software selectable audio alert tone outputs
• 4-bit software-selectable, sound pressure level control
MC68HC(9)08PT48 — Rev. 2.0
MOTOROLA
Advance Information
325
Alert Output Generator (ALR)
FREESCALE [ Freescale ]
