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Micrel
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
MICRF506BML/YML
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.
to change the way the MICRF506 works.
What to write
What to write
Field
Comments
1
Octet:
wanted
values
for
octet wants values for
octets. So the 22
Field
Address:
R/W bit:
Values:
Comments
‘000000’ (address of the first register to write
to, which is 0)
“0” for writing
st
ControlRegister0. 2 nd Octet: wanted values
for ControlRegister1 and so on for all of the
nd
Address:
R/W bit:
Values:
7 bit = A6, A5, …A0 (A6 = msb. A0 = lsb)
(address of first byte to write to)
“0” for writing
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”)
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.
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
How to write:
?
?
Use SCLK and IO to clock in the 23 octets
Bring CS low
?
?
Bring CS high
Use SCLK and IO to clock in the 1 + n
Refer to the figure in the next section, “Writing to n
registers having incremental addresses”.
?
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.
CS
SCLK
IO
A6
A5
A0
RW
D7
D6
D2
D1
D0
Address of first
register to write to,
RW Data to write
into register i
Data to write
into register i+1
register i
Figure 2.
Internal load pulse made here
July 2006
11
M9999-092904
+1 408-944-0800
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