3.1.4 General-Purpose Timer (GPT)
• Two 16-Bit Free-Running Counters With One Nine-Stage Prescaler
• Three Input Capture Channels
• Four Output Compare Channels
• One Input Capture/Output Compare Channel
• One Pulse Accumulator/Event Counter Input
• Two Pulse-Width Modulation Outputs
• Optional External Clock Input
3.2 System Block Diagram and Pin Assignment Diagrams
Figure 3-1 is a functional diagram of the MCU. Although diagram blocks represent the
relative size of the physical modules, there is not a one-to-one correspondence be-
tween location and size of blocks in the diagram and location and size of integrated-
circuit modules. Figure 3-2 shows the pin assignments of the 132-pin plastic surface-
mount package. Figure 3-3 shows the pin assignments of the 144-pin plastic surface-
mount package. Refer to APPENDIX B MECHANICAL DATA AND ORDERING IN-
FORMATION for package dimensions. All pin functions and signal names are shown
in this drawing. Refer to subsequent paragraphs in this section for pin and signal de-
scriptions.
3
MOTOROLA
3-2
OVERVIEW
MC68331
USER’S MANUAL
MOTOROLA [ MOTOROLA ]
