micrf506 Micrel Semiconductor, micrf506 Datasheet - Page 11

• Manufacturer Part Number: micrf506
• Description: 410mhz And 450mhz Ism Band Transceiver
• Manufacturer: Micrel Semiconductor

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:
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:
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.
Micrel
September 2004
•
•
1. Enter address and R/W bit
2. Change direction of IO line
3. Read out a number of octets and change IO
Disable the generation of load-signals by
c l e a r i n g
ControlRegister0)
Repeat for each group of register having
incremental addresses:
direction back again.
o
o
o
o
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”
b i t
“ l o a d _ e n ”
( b i t 0
i n
11
Reading n registers from MICRF506
Simple time
IO Input
IO Output
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.
Programming interface timing
SCLK
CS
IO
•
•
•
•
•
•
Figure 4 and Table 6 shows the timing specification for the
3-wire serial programming interface.
CS
SCLK
IO
Tcsr
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.
A6
Address Register
traise
Address of register i
A6
A5
tfall
A5
Figure 3.
Figure 4.
Tper
A0
A0
RW
Tlow
RW D7
RWData read from reg. i
Thigh
D7
Tread
D6
D6
[phone]
M9999-092904
Data Register
MICRF506
D0
Twrite
D2
D1
D0
LOAD
Tscl