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CY28344 Datasheet(PDF) 5 Page - SpectraLinear Inc |
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CY28344 Datasheet(HTML) 5 Page - SpectraLinear Inc |
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5 / 21 page  CY28344 Rev 1.0, November 21, 2006 Page 5 of 21 Data Byte Configuration Map Table 3. Byte Read and Byte Write Protocol Byte Write Protocol Byte Read Protocol Bit Description Bit Description 1Start 1Start 2:8 Slave address – 7 bit 2:8 Slave address – 7 bit 9Write 9Write 10 Acknowledge from slave 10 Acknowledge from slave 11:18 Command Code – 8 bit “1xxxxxxx” stands for byte operation bit[6:0] of the command code represents the offset of the byte to be accessed 11:18 Command Code – 8 bit “1xxxxxxx” stands for byte operation bit[6:0] of the command code represents the offset of the byte to be accessed 19 Acknowledge from slave 19 Acknowledge from slave 20:27 Data byte – 8 bits 20 Repeat start 28 Acknowledge from slave 21:27 Slave address – 7 bits 29 Stop 28 Read 29 Acknowledge from slave 30:37 Data byte from slave – 8 bits 38 Not acknowledge 39 Stop Data Byte 0 Bit Pin# Name Description Power On Default Bit 7 -- SEL3 SW Frequency selection bits. See Table 4.0 Bit 6 -- SEL2 0 Bit 5 -- SEL1 0 Bit 4 -- SEL0 0 Bit 3 -- FS_Override 0 = Select operating frequency by FS[4:0] input pins 1 = Select operating frequency by SEL[4:0] settings 0 Bit 2 -- SEL4 SW Frequency selection bits. See Table 4.0 Bit 1 -- Spread Spectrum Enable 0 = OFF; 1 = Enabled 0 Bit 0 -- Reserved Reserved 0 Data Byte 1 Bit Pin# Name Description Power On Default Bit 7 40, 39 CPU2, CPU2# (Active/Inactive) 1 Bit 6 44, 43 CPU1, CPU1# (Active/Inactive) 1 Bit 5 47, 46 CPU0, CPU0# (Active/Inactive) 1 Bit 4 -- Latched FS4 input Latched FS[4:0] inputs. These bits are Read-only. X Bit 3 -- Latched FS3 input X Bit 2 -- Latched FS2 input X Bit 1 -- Latched FS1 input X Bit 0 -- Latched FS0 input X |
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