M68HC11K_13 Datasheet, PDF (182/290 Pages) Freescale Semiconductor, Inc – M68HC11K Family Technical Data

Timing System
Freescale Semiconductor, Inc.
9.7.4
9.7.5
Timer Interrupt Mask 2 Register. . . . . . . . . . . . . . . . . . . . . 207
Pulse Accumulator Count Register . . . . . . . . . . . . . . . . . .208
9.8 Real-Time Interrupt (RTI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
9.8.1 Timer Interrupt Flag 2 Register . . . . . . . . . . . . . . . . . . . . . 209
9.8.2 Timer Interrupt Mask 2 Register. . . . . . . . . . . . . . . . . . . . . 209
9.8.3 Pulse Accumulator Control Register . . . . . . . . . . . . . . . . . 210
9.9 Pulse-Width Modulator (PWM) . . . . . . . . . . . . . . . . . . . . . . . . 211
9.9.1 PWM System Description. . . . . . . . . . . . . . . . . . . . . . . . . . 211
9.9.2 Pulse-Width Modulation Control Registers. . . . . . . . . . . . . 213
9.9.2.1 Pulse-Width Modulation Timer
Clock Select Register . . . . . . . . . . . . . . . . . . . . . . . . 213
9.9.2.2 Pulse-Width Modulation Timer Polarity Register . . . . . . 215
9.9.2.3 Pulse-Width Modulation Timer Prescaler Register . . . .215
9.9.2.4 Pulse-Width Modulation Timer Enable Register . . . . . . 216
9.9.2.5 Pulse-Width Modulation Timer
Counters1 to 4 Registers . . . . . . . . . . . . . . . . . . . . . 217
9.9.2.6 Pulse-Width Modulation Timer
Periods 1 to 4 Registers . . . . . . . . . . . . . . . . . . . . . . 218
9.9.2.7 Pulse-Width Modulation Timer
Duty Cycle 1 to 4 Registers . . . . . . . . . . . . . . . . . . .219
9.2 Introduction
M68HC11 microcontrollers contain an extensive timing system to
support a wide variety of timer-related functions. This section discusses
the nature of the timing system and presents details of timer-related
functions including:
• Input capture/output compare (IC/OC)
• Real-time interrupt (RTI)
• Pulse accumulator (PA)
• Pulse width modulation (PWM)
Technical Data
182
Timing System
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M68HC11K Family
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