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MC68340 データシート(PDF) 45 Page - Freescale Semiconductor, Inc |
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MC68340 データシート(HTML) 45 Page - Freescale Semiconductor, Inc |
45 / 441 page MOTOROLA MC68340 USER’S MANUAL 2- 11 2.13 SERIAL MODULE SIGNALS The following signals are used by the serial module for data and clock signals. See Section 7 Serial Module for more information on these signals. 2.13.1 Serial Crystal Oscillator (X2, X1) These pins furnish the connection to a crystal or external clock, which must be supplied when using the baud rate generator. An external clock is connected to the X1 pin; X2 is left floating. 2.13.2 Serial External Clock Input (SCLK) This input can be used as the external clock input for channel A or channel B, bypassing the baud rate generator. 2.13.3 Receive Data (RxDA, RxDB) These signals are the receiver serial data input for each channel. Data received on this signal is sampled on the rising edge of the clock source, with the least significant bit received first. 2.13.4 Transmit Data (TxDA, TxDB) These signals are the transmitter serial data output for each channel. The output is held high ('mark' condition) when the transmitter is disabled, idle, or operating in the local loopback mode. Data is shifted out on this signal at the falling edge of the clock source, with the least significant bit transmitted first. 2.13.5 Clear to Send (CTSA, CTSB) These active-low signals can be programmed as the clear-to-send inputs for each channel. 2.13.6 Request to Send (RTSA, RTSB) These active-low signals can be programmed as request-to-send outputs or used as discrete outputs. RTSB, RTSA When used for this function, these signals function as the request-to-send outputs. OP1, OP0 When used for this function, these outputs are controlled by the value of bit 1 and bit 0, respectively, in the output port data registers. 2.13.7 Transmitter Ready (T ≈RDYA) This active-low output can be programmed as the channel A transmitter ready status indicator or used as a discrete output. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
同様の部品番号 - MC68340 |
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同様の説明 - MC68340 |
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