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S3F80K5_UM_REV1.11
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COUNTER A
COUNTER A
OVERVIEW
The S3F80K5 microcontroller has one 8-bit counter called counter A. Counter A, which can be used to generate
the carrier frequency, has the following components (See Figure 12-1):
— Counter A control register, CACON
— 8-bit down counter with auto-reload function
— Two 8-bit reference data registers, CADATAH and CADATAL
Counter A has two functions:
— As a normal interval timer, generating a counter A interrupt (IRQ2, vector ECH) at programmed time intervals.
— To supply a clock source to the 16-bit timer/counter module, Timer 1, for generating the Timer 1 overflow
interrupt.
NOTE
The CPU clock should be faster than count A clock.
12-1