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MC68HC912BL16 Datasheet(PDF) 90 Page - NXP Semiconductors |
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MC68HC912BL16 Datasheet(HTML) 90 Page - NXP Semiconductors |
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90 / 128 page  MC68HC912BL16 90 MC68HC912BL16TS/D BTST — Baud Register Test Reserved for test function BSPL — Baud Rate Counter Split Reserved for test function BRLD — Baud Rate Reload Reserved for test function Read or write anytime. LOOPS — SCI LOOP Mode/Single Wire Mode Enable 0 = SCI transmit and receive sections operate normally. 1 = SCI receive section is disconnected from the RXD pin and the RXD pin is available as general purpose I/O. The receiver input is determined by the RSRC bit. The transmitter output is con- trolled by the associated DDRS bit. Both the transmitter and the receiver must be enabled to use the LOOP or the single wire mode. If the DDRS bit associated with the TXD pin is set during the LOOPS = 1, the TXD pin outputs the SCI waveform. If the DDRS bit associated with the TXD pin is clear during the LOOPS = 1, the TXD pin be- comes high (IDLE line state) for RSRC = 0 and high impedance for RSRC = 1. Refer to Table 30. WOMS — Wired-Or Mode for Serial Pins This bit controls the two pins (TXD and RXD) associated with the SCI section. 0 = Pins operate in a normal mode with both high and low drive capability. To affect the RXD bit, that bit would have to be configured as an output (via DDRS) which is the single wire case when using the SCI. WOMS bit still affects general-purpose output on TXD and RXD pins when SCI is not using these pins. 1 = Each pin operates in an open drain fashion if that pin is declared as an output. RSRC — Receiver Source When LOOPS = 1, the RSRC bit determines the internal feedback path for the receiver. 0 = Receiver input is connected to the transmitter internally (not TXD pin) 1 = Receiver input is connected to the TXD pin M — Mode (select character format) 0 = One start, eight data, one stop bit 1 = One start, eight data, ninth data, one stop bit SC0CR1 — SCI Control Register 1 $00C2 Bit 7 6 5 4 3 2 1 Bit 0 LOOPS WOMS RSRC M WAKE ILT PE PT RESET: 0 0 0 0 0 0 0 0 Table 30 Loop Mode Functions LOOPS RSRC DDS1 WOMS Function of Port S Bit 1 0 x x x Normal Operations 1 0 0 0/1 LOOP mode without TXD output (TXD = High Impedance) 1 0 1 0 LOOP mode with TXD output (CMOS) 1 0 1 1 LOOP mode with TXD output (open-drain) 1 1 0 x Single wire mode without TXD output (the pin is used as receiver input only, TXD = High Impedance) 1 1 1 0 Single wire mode with TXD output (the output is also fed back to receiver input, CMOS) 1 1 1 1 Single wire mode for the receiving and transmitting (open-drain) Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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