
MC68HC912B32 MC68HC12BE32 — Rev. 3.0
Advance Information
MOTOROLA
Enhanced Capture Timer (ECT) Module
223
Advance Information — MC68HC912B32 MC68HC12BE32
Section 13. Enhanced Capture Timer (ECT) Module
13.1 Contents
13.2
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224
13.3
Basic Timer Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225
13.4
13.4.1
13.4.1.1
13.4.1.2
13.4.2
13.4.2.1
13.4.2.2
13.4.3
Enhanced Capture Timer Modes of Operation. . . . . . . . . . . .225
IC Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .226
Non-Buffered IC Channels. . . . . . . . . . . . . . . . . . . . . . .226
Buffered IC Channels. . . . . . . . . . . . . . . . . . . . . . . . . . .226
Pulse Accumulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .227
Pulse Accumulator Latch Mode . . . . . . . . . . . . . . . . . . .232
Pulse Accumulator Queue Mode . . . . . . . . . . . . . . . . . .232
Modulus Down-Counter . . . . . . . . . . . . . . . . . . . . . . . . . . .232
13.5
13.5.1
13.5.2
13.5.3
13.5.4
13.5.5
13.5.6
13.5.7
13.5.8
13.5.9
13.5.10 Timer Input Capture/Output Compare Registers . . . . . . . .244
13.5.11 16-Bit Pulse Accumulator A Control Register. . . . . . . . . . .248
13.5.12 Pulse Accumulator A Flag Register . . . . . . . . . . . . . . . . . .250
13.5.13 Pulse Accumulators Count Registers. . . . . . . . . . . . . . . . .251
13.5.14 16-Bit Modulus Down-Counter Control Register . . . . . . . .253
13.5.15 16-Bit Modulus Down-Counter Flag Register. . . . . . . . . . .255
13.5.16 Input Control Pulse Accumulators Control Register. . . . . .256
13.5.17 Delay Counter Control Register . . . . . . . . . . . . . . . . . . . . .257
Timer Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232
Timer Input Capture/Output Compare Select Register . . .233
Timer Compare Force Register . . . . . . . . . . . . . . . . . . . . .233
Output Compare 7 Mask Register . . . . . . . . . . . . . . . . . . .234
Output Compare 7 Data Register. . . . . . . . . . . . . . . . . . . .235
Timer Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . .236
Timer System Control Register . . . . . . . . . . . . . . . . . . . . .237
Timer Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . .238
Timer Interrupt Mask Registers . . . . . . . . . . . . . . . . . . . . .241
Main Timer Interrupt Flag Registers. . . . . . . . . . . . . . . . . .243