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DSP56303 数据表(PDF) 137 Page - Freescale Semiconductor, Inc |
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DSP56303 数据表(HTML) 137 Page - Freescale Semiconductor, Inc |
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137 / 292 page  ESSI Data and Control Signals DSP56303 User’s Manual, Rev. 2 Freescale Semiconductor 7-5 When configured as an output, SC1 functions as a serial Output Flag, as the transmitter 0 drive-enabled signal, or as the receive frame sync signal output. If SC1 is used as serial Output Flag 1, its value is determined by the value of the serial Output Flag 1 (OF1) bit in the CRB. When configured as an input, this signal can receive frame sync signals from an external source, or it acts as a serial input flag. As a serial input flag, SC1controls status bit IF1 in the SSISR. When SC1 is configured as a transmit data signal, it is always an output signal, regardless of the SCD1 bit value. As an output, it is fully synchronized with the other ESSI transmit data signals (STD and SC0). SC1 can be programmed as a GPIO signal (P1) when the ESSI SC1 function is not in use. 7.2.6 Serial Control Signal (SC2) ESSI0:SC02; ESSI1:SC12 SC2 is a frame sync I/O signal for both the transmitter and receiver in Synchronous mode and for the transmitter only in Asynchronous mode. The direction of this signal is determined by the SCD2 bit in the CRB. When configured as an output, this signal outputs the internally generated frame sync signal. When configured as an input, this signal receives an external frame sync signal for the transmitter in Asynchronous mode and for both the transmitter and receiver when in Synchronous mode. SC2 can be programmed as a GPIO signal (P2) when the ESSI SC2 function is not in use. 1 1 0 0 1 F0/U F1/T0D/U FS XC TD0 RD 1 1 0 1 0 F0/U TD2 FS XC TD0 U 1 1 0 1 1 F0/U TD2 FS XC TD0 RD 1 1 1 0 0 TD1 F1/T0D/U FS XC TD0 U 1 1 1 0 1 TD1 F1/T0D/U FS XC TD0 RD 1 1 1 1 0 TD1 TD2 FS XC TD0 U 1 1 1 1 1 TD1 TD2 FS XC TD0 RD TXC = Transmitter clock RXC = Receiver clock XC = Transmitter/receiver clock (synchronous operation) FST = Transmitter frame sync FSR = Receiver frame sync FS = Transmitter/receiver frame sync (synchronous operation) TD0 = Transmit data signal 0 TD1 = Transmit data signal 1 TD2 = Transmit data signal 2 T0D = Transmitter 0 drive enable if SSC1 = 1 & SCD1 = 1 RD = Receive data F0 = Flag 0 F1 = Flag 1 if SSC1 = 0 U = Unused (can be used as GPIO signal) X = Indeterminate Table 7-2. Mode and Signal Definitions (Continued) Control Bits ESSI Signals SYN TE0 TE1 TE2 RE SC0 SC1 SC2 SCK STD SRD |
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