MICRF506BML datasheet(12/42 Pages) MICREL

12 / 42 page

Micrel

MICRF506BML/YML

Writing to n Registers having Non-Incremental

Addresses

Registers with non-incremental addresses can be

written to in one write-sequence as well. Example of

non-incremental addresses: “0,1,3”. However, this

requires more overhead, and the user should

consider the possibility to make a “continuous”

update, for example, by writing to “0,1,2,3” (writing

the present value of “2” into “2”). The simplest

firmware is achieved by always writing to all

registers. Refer to previous sections.

This write-sequence is divided into several sub-

parts:

•

Disable the generation of load-signals by

clearing

bit

“load_en”

(bit0

ControlRegister0)

•

Repeat for each group of register having

incremental addresses:

Bring CS active

Enter first address for this group,

R/W bit and values

Bring CS inactive

Finally, enable and make a load-

signal by setting “load_en”

Refer to the previous sections for how to write to 1 or

n (with incremental addresses) registers in the

MICRF506.

Reading from the control registers in MICRF506

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 MICRF506 (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 MICRF506

SCLK

RW D7

Address of register i

RWData read from reg. i

Simple time

IO Input

IO Output

Figure 3.

In the figure, 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

MICRF506. 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.

Programming interface timing

Figure 4 and Table 6 shows the timing specification for the

3-wire serial programming interface.

SCLK

Address Register

Data Register

LOAD

Tscl

Twrite

Tread

Thigh

Tlow

Tper

Tcsr

traise

tfall

Figure 4.

July 2006

M9999-092904

+1 408-944-0800

MICRF506BML Datasheet(PDF) 12 Page - Micrel Semiconductor

MICRF506BML Datasheet(HTML) 12 Page - Micrel Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

Datasheet Download

Link URL