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Micrel
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
MICRF506BML/YML
Reading n registers from MICRF506
CS
SCLK
non-incremental addresses: “0,1,3”. However, this
requires more overhead, and the user should
IO
A6
A5
A0
RW D7
D6
D0
consider the possibility to make a “continuous”
update, for example, by writing to “0,1,2,3” (writing
Address of register i
RWData read from reg. i
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:
Simple time
IO Input
IO Output
Figure 3.
In the figure, 1 register is read. The address is A6,
?
?
Disable the generation of load-signals by
clearing bit “load_en” (bit0 in
ControlRegister0)
Repeat for each group of register having
incremental addresses:
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.
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”
?
?
?
?
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)
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
?
?
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.
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
Programming interface timing
Figure 4 and Table 6 shows the timing specification for the
3-wire serial programming interface.
line is output from the MICRF506 (input to user) for a
part of the read-sequence. Refer to procedure
Tcsr
traise
tfall
Tper
Thigh Tread
Tlow
Twrite
Tscl
description below.
A read-sequence is described for reading n
registers, where n is number 1-23.
SCLK
CS
IO
A6
A5
A0
RW
D7
D6
D2
D1
D0
Address Register
Data Register
LOAD
Figure 4.
July 2006
12
M9999-092904
+1 408-944-0800
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