Datasheet

DS80C320/DS80C323 High-Speed/Low-Power Microcontrollers
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SERIAL PORT MODE 0 TIMING
SERIAL PORT 0 (SYNCHRONOUS MODE)
HIGH SPEED OPERATION SM2 = 1 TXD CLOCK = XTAL/4
SERIAL PORT 0 (SYNCHRONOUS MODE)
SM2 = 0 TXD CLOCK = XTAL/12