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RFB433B Datasheet(PDF) 9 Page - Micrel Semiconductor |
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RFB433B Datasheet(HTML) 9 Page - Micrel Semiconductor |
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9 / 18 page  Micrel, Inc. MICRF620 December 2005 9 M9999-120205 How to write: • Bring CS high • Use SCLK and IO to clock in the 23 octets • Bring CS low Refer to the figure in the next section, “Writing to n registers having incremental addresses”. Writing to n Registers Having Incremental Addresses In addition to entering all bytes, it is also possible to enter a set of n bytes, starting from address i = “A6, A5, … A0”. Typical example: Clock in a new set of frequency dividers (i.e. change the RF frequency). “Incremental addresses”. Registers to be written are located in i, i+1, i+2. What to write: Field Comments Address: 7 bit = A6, A5, …A0 (A6 = msb. A0 = lsb) (address of first byte to write to) R/W bit: “0” for writing Values: n* 8 bits = D7, D6, …D0 (D7 = msb, D0 = lsb) (written to control reg. with address ”i”) D7, D6, …D0 (D7 = msb, D0 = lsb) (written to control reg. with address ”i+1”) D7, D6, …D0 (D7 = msb, D0 = lsb) (written to control reg. with address ”i+n-1”) Table 5. “Address” and “R/W bit” together make 1 octet. In addition, n octets with programming bits are entered. Totally. 1 +n octets are clocked into the MICRF620. How to write: • Bring CS high • Use SCLK and IO to clock in the 1 + n octets • Bring CS low In Figure 1, IO is changed at positive edges of SCLK. The MICRF620 samples the IO line at negative edges. The value of the R/W bits is always “0” for writing. CS SCLK IO A6 A5 A0 RW D7 D6 D2 D1 D0 Address of first RW register to write to, register i Data to write into register i Internal load pulse made here Data to write into register i+1 Figure 2. How to write to many Control Registers Reading from the Control Registers in MICRF620 The “read-sequence” is: 1. Enter address and R/W bit 2. Change direction of IO line 3. Read out a number of octets and change IO direction back again. It is possible to read all, 1 or n registers. The address to read from (or the first address to read from) can be any valid address (0-22). Reading is not destructive, i.e. values are not changed. The IO line is output from the MICRF620 (input to user) for a part of the read-sequence. Refer to procedure description below. A read-sequence is described for reading n registers, where n is number 1-23. Reading n Registers from MICRF620 CS SCLK IO A6 A5 A0 RW D7 D6 D0 Address of register i RWData read from reg. i Simple time IO Input IO Output Figure 3. How to read from many Control Registers In Figure 3, 1 register is read. The address is A6, A5, … A0. A6 = msb. The data read out is D7, D6, …D0. The value of the R/W bit is always “1” for reading. SCLK and IO together form a serial interface. SCLK is applied externally for reading as well as for writing. • Bring CS active • Enter address to read from (or the first address to read from) (7 bits) and • The R/W bit = 1 to enable reading • Make the IO line an input to the user (set pin in tristate) • Read n octets. The first rising edge of SCLK will set the IO as an output from the MICRF620. MICRF will change the IO line at positive edges. The user should read the IO line at the negative edges. • Make the IO line an output from the user again. |
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Similar Description - RFB433B |
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