MICRF506BML datasheet(7/28 Pages) MICREL

7 / 28 page

Micrel

MICRF506

September 2004

M9999-092904

(408) 955-1690

Programming

General

The MICRF506 functions are enabled through a

number of programming bits. The programming bits

are organized as a set of addressable control

registers, each register holding 8 bits.

There are 23 control registers in total in the

MICRF506, and they have addresses ranging from 0

to 22. The user can read all the control registers.

The user can write to the first 22 registers (0 to 21);

the register 22 is a read-only register.

All control registers hold 8 bits and all 8 bits must be

written to when accessing a control register, or they

will be read. Some of the registers do not utilize all 8

bits. The value of an unused bit is “don’t care.”

The control register with address 0 is referred to as

ControlRegister0, the control register with address 1

is ControlRegister1 and so on. A summary of the

control registers is given in the table below. In

addition to the unused bits (marked with”-“) there are

a number of fixed bits (marked with “0” or “1”).

Always maintain these as shown in the table.

The control registers in MICRF506 are accessed

through a 3-wire interface; clock, data and chip

select. These lines are referred to as SCLK, IO, and

CS, respectively. This 3-wire interface is dedicated

to control register access and is referred to as the

control interface. Received data (via RF) and data to

transmit (via RF) are handled by the DataIXO and

DatalClk (if enabled) lines; this is referred to as the

data interface.

The SCLK line is applied externally; access to the

control registers are carried out at a rate determined

by the user. The MICRF506 will ignore transitions on

the SCLK line if the CS line is inactive. The

MICRF506 can be put on a bus, sharing clock and

data lines with other devices.

All control registers should be initiated (written to)

following a power-on. During operation, however,

writing to one register is sufficient to change the way

the transceiver works.

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