Cypress CY25822-2 manual

													CY25822-2
Table 2. Block Read and Block Write Protocol (continued)
....			Data Byte N –8 bits								56	Acknowledge
....			Acknowledge from slave								....	Data bytes from slave/Acknowledge
....			Stop								....	Data byte N from slave – 8 bits
											....	Not Acknowledge
											....	Stop
Table 3. Byte Read and Byte Write Protocol
				Byte Write Protocol								Byte Read Protocol
Bit						Description					Bit		Description
1			Start								1	Start
2:8			Slave address – 7 bits								2:8	Slave address – 7 bits
9			Write = 0								9	Write = 0
10			Acknowledge from slave								10	Acknowledge from slave
11:18			Command Code – 8 bits								11:18	Command Code – 8 bits
			'1xxxxxxx' stands for byte operation, bits[6:0] of									'1xxxxxxx' stands for byte operation, bits[6:0]
			the command code represents the offset of the									of the command code represents the offset of
			byte to be accessed									the byte to be accessed
19			Acknowledge from slave						19			Acknowledge from slave
20:27			Data byte from master – 8 bits						20			Repeat start
28			Acknowledge from slave						21:27			Slave address – 7 bits
29			Stop						28			Read = 1
									29			Acknowledge from slave
									30:37			Data byte from slave – 8 bits
									38			Not Acknowledge
									39			Stop
Byte 0: Control Register
Bit	@Pup			Pin#			Name					Pin Description
7	1			4		SS0			–
6	0			4		SS1			–
5	0			4		SS2			–
4	0			4		SS3			–
3	1					Not Applicable			Reserved, must be written as 1
2	1			4, 5		CLKOUT,			Power-down three-state enable
						REFOUT			0 = three-state outputs, 1 = drive outputs low
									(Applies only in Power Down State)
1	1			4		CLKOUT			Spread Spectrum enable
									0 = spread off, 1 = spread on
0	0					Not Applicable			No Pins
Table 4. Spread Spectrum Select
SS3			SS2		SS1			SS0		Spread Mode			Spread Amount%
0		0			0			0			Down		0.8
0		0			0			1			Down		1.0
0		0			1			0			Down		1.25
0		0			1			1			Down		1.5
0		1			0			0			Down		1.75
Document #: 38-07531 Rev. **													Page 3 of 9

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