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MICRF505LYML Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MICRF505LYML Datasheet(HTML) 10 Page - Micrel Semiconductor |
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10 / 43 page  Micrel MICRF505BML/YML August 2006 10 M9999-092904 +1 408-944-0800 Writing to the control registers in MICRF505 Writing: A number of octets are entered into MICRF505 followed by a load-signal to activate the new setting. Making these events is referred to as a “write sequence.” It is possible to update all, 1, or n control registers in a write sequence. The address to write to (or the first address to write to) can be any valid address (0-21). The IO line is always an input to the MICRF505 (output from user) when writing. What to write: • The address of the control register to write to (or if more than 1 control register should be written to, the address of the 1 st control register to write to). • A bit to enable reading or writing of the control registers. This bit is called the R/W bit. • The values to write into the control register(s). What to write: Field Comments Address: A 7-bit field, ranging from 0 to 21. MSB is written first. R/W bit: A 1-bit field, = “0” for writing Values: A number of octets (1-22 octets). MSB in every octet is written first. The first octet is written to the control register with the specified address (=”Address”). The next octet (if there is one) is written to the control register with address = “Address + 1” and so on. Table 2. How to write: Bring CS active to active to start a write sequence. The active state of the CS line is “high.” Use the SCLK/IO serial interface to clock “Address” and “R/W” bit and “Values” into the MICRF505. MICRF505 will sample the IO line at negative edges of SCLK. Make sure to change the state of the IO line before the negative edge. Refer to figures below. Bring CS inactive to make an internal load-signal and complete the write-sequence. Note: there is an exception to this point. If the programming bit called “load_en” (bit0 in ControlRegister0) is “0”, then no load pulse is generated. The two different ways to “program the chip” are: • Write to a number of control registers (0-22) when the registers have incremental addresses (write to 1, all or n registers) • Write to a number of control registers when the registers have non-incremental addresses. Writing to a Single Register Writing to a control register with address “A6. A5, …A0” is described here. During operation, writing to 1 register is sufficient to change the way the transceiver works. Typical example: Change from receive mode to power-down. What to write: Field Comments Address: 7 bit = A6, A5, …A0 (A6 = msb. A0 = lsb) R/W bit: “0” for writing Values: 8 bits = D7, D6, …D0 (D7 = msb, D0 = lsb) Table 3. “Address” and “R/W bit” together make 1 octet. In addition, 1 octet with programming bits is entered. In total, 2 octets are clocked into the MICRF505. How to write: • Bring CS high • Use SCLK and IO to clock in the 2 octets • Bring CS low CS SCLK IO A6 A5 A0 RW D7 D6 D2 D1 D0 Address of register i RW Data to write into register i Internal load pulse made here Figure 1. In Figure 1, IO is changed at positive edges of SCLK. The MICRF505 samples the IO line at negative edges. The value of the R/W bits is always “0” for writing. |
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