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MC68332GCFC20 Datasheet(PDF) 80 Page - Freescale Semiconductor, Inc |
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MC68332GCFC20 Datasheet(HTML) 80 Page - Freescale Semiconductor, Inc |
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80 / 88 page  MOTOROLA MC68332 80 MC68332TS/D Writing a value of zero to SCBR disables the baud rate generator. The following table lists the SCBR settings for standard and maximum baud rates using 16.78-MHz and 20.97-MHz system clocks. SCCR1 contains SCI configuration parameters. The CPU can read and write this register at any time. The SCI can modify RWU in some circumstances. In general, interrupts enabled by these control bits are cleared by reading SCSR, then reading (receiver status bits) or writing (transmitter status bits) SCDR. Bit 15 — Not Implemented LOOPS — Loop Mode 0 = Normal SCI operation, no looping, feedback path disabled 1 = Test SCI operation, looping, feedback path enabled LOOPS controls a feedback path on the data serial shifter. When loop mode is enabled, SCI transmitter output is fed back into the receive serial shifter. TXD is asserted (idle line). Both transmitter and receiver must be enabled before entering loop mode. WOMS — Wired-OR Mode for SCI Pins 0 = If configured as an output, TXD is a normal CMOS output. 1 = If configured as an output, TXD is an open-drain output. WOMS determines whether the TXD pin is an open-drain output or a normal CMOS output. This bit is used only when TXD is an output. If TXD is used as a general-purpose input pin, WOMS has no effect. ILT — Idle-Line Detect Type 0 = Short idle-line detect (start count on first one) 1 = Long idle-line detect (start count on first one after stop bit(s)) PT — Parity Type 0 = Even parity 1 = Odd parity When parity is enabled, PT determines whether parity is even or odd for both the receiver and the trans- mitter. Table 27 SCI Baud Rates Nominal Baud Rate Actual Rate with 16.78-MHz Clock SCBR Value Actual Rate with 20.97-MHz Clock SCBR Value 64* 64.0 $1FFF — — 110 110.0 $129E 110.0 $1745 300 299.9 $06D4 300.1 $0888 600 599.9 $036A 600.1 $0444 1200 1199.7 $0165 1200.3 $0222 2400 2405.0 $00DA 2400.6 $0111 4800 4810.0 $006D 4783.6 $0089 9600 9532.5 $0037 9637.6 $0044 19200 19418.1 $0016 19275.3 $0022 38400 37449.1 $000E 38550.6 $0011 76800 74898.3 $0007 72817.8 $0009 Maximum Rate 524288.0 $0001 655360.0 $0001 SCCR1 — SCI Control Register 1 $YFFC0A 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 LOOPS WOMS ILT PT PE M WAKE TIE TCIE RIE ILIE TE RE RWU SBK RESET: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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