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CHAPTER 8
FREQUENCY GENERATOR
The 8XC196MD has a peripheral not found on other 8XC196Mx devices — the frequency gen-
erator. This peripheral produces a waveform with a fixed duty cycle (50%) and a programmable
frequency (ranging from 4 kHz to 1 MHz with a 16-MHz input clock). One application for the
frequency generator is to drive an infrared LED to transmit remote control data and control sig-
nals.
This chapter describes the frequency generator and explains how to configure it. For detailed de-
scriptions of the signals discussed in this chapter, refer to Appendix B, "Signal Descriptions." For
additional information and application examples, consult AP-483, Application Examples Using
the 8XC196MC/MD Microcontroller (order number 272282).
8.1
FUNCTIONAL OVERVIEW
The frequency generator (Figure 8-1) has a frequency register, a count register, and an output sig-
nal. The output signal shares pin P7.7, so you must configure the pin for its frequency generator
output function.
8
FREQ_GEN
8
Port 7
Control
D
Q#
8
Down-
Load
Counter
P7_MODE
P7.7/FREQOUT
FREQ_CNT
P7_DIR
C
Q
P7_REG
Count = 0
A2702-01
Figure 8-1. Frequency Generator Block Diagram
8-1
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