MICRF506 datasheet(10/28 Pages) MICREL

10 / 28 page

Micrel

MICRF506

September 2004

M9999-092904

(408) 955-1690

Writing to All Registers

After a power-on, all writable registers should be

written. This is described here.

Writing to all register can be done at any time. To

get the simplest firmware, always write to all

registers. The price to pay for the simplicity is

increased write-time, which leads to increased time

to change the way the MICRF506 works.

What to write

Field

Comments

Address:

‘000000’ (address of the first register to write

to, which is 0)

R/W bit:

“0” for writing

Values:

1st

Octet:

wanted

values

for

ControlRegister0. 2nd Octet: wanted values

for ControlRegister1 and so on for all of the

octets. So the 22nd octet wants values for

ControlRegister21. Refer to the specific

sections of this document for actual values.

Table 4.

“Address” and “R/W bit” together make 1 octet.

In addition, 22 octets with programming bits are entered.

In total, 23 octets are clocked into the MICRF506.

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 MICRF506.

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

MICRF506 samples the IO line at negative edges. The

value of the R/W bits is always “0” for writing.

SCLK

Address of first

Data to write

into register i

Internal load pulse made here

Data to write

into register i+1

Figure 2.

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