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HC705JB2GRS/H 数据表(PDF) 71 Page - NXP Semiconductors |
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HC705JB2GRS/H 数据表(HTML) 71 Page - NXP Semiconductors |
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71 / 128 page ![]() August 28, 1998 GENERAL RELEASE SPECIFICATION UNIVERSAL SERIAL BUS MODULE REV 1.1 10-3 10.2.1 USB Protocol Figure 10-2 shows the various transaction types supported by the MC68HC705JB2 USB module. The transactions are portrayed as error free. The effect of errors in the data flow are discussed later. Figure 10-2. Supported Transaction Types per Endpoint Each USB transaction is comprised of a series of packets. The MC68HC705JB2 USB module supports the packet types shown in Figure 10-3. Token packets are generated by the USB host and decoded by the USB device. Data and Handshake packets are both decoded and generated by the USB device depending on the type of transaction. SETUP IN OUT DATA0/1 DATA0 DATA1 ACK DATA1 OUT ACK OUT DATA0 ACK ACK DATA0/1 ENDPOINT 0 TRANSACTIONS: Control Write Control Read No-Data Control ENDPOINTS 1 & 2 TRANSACTIONS: Interrupt Bulk Transmit IN ACK KEY: Unrelated Bus Traffic Host Generated Device Generated ACK SETUP OUT IN DATA0/1 DATA0 DATA1 ACK DATA1 IN ACK IN DATA0 ACK ACK ACK SETUP IN DATA0 DATA1 ACK ACK DATA0/1 IN ACK Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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