mrf89xa Microchip Technology Inc., mrf89xa Datasheet - Page 46

• Manufacturer Part Number: mrf89xa
• Description: Ultra-low Power, Integrated Ism Band Sub-ghz Transceiver
• Manufacturer: Microchip Technology Inc.

2.16.2
REGISTER 2-18:
DS70622B-page 46
MRF89XA
bit 7
R = Readable bit
-n = Value at POR
r = Reserved
bit 7-4
bit 3-0
R/W-0
POLYPHASE FILTER
CONFIGURATION REGISTER
DETAILS
POLCFV<3:0>: Polyphase Centre Frequency Value bits
These bits indicate the center frequency of the polyphase filter (typically recommended to 100 kHz).
POLCFV<3:0> = 0011
f
Where,
POLCFV is the value in the register
f
f
f
Reserved<3:0>: Reserved bits; do not use
1000 = Reserved (default)
o
c
o
xtal
= 200 kHz * (f
is the center frequency
is the local oscillator frequency
R/W-0
is the crystal oscillator frequency
POLCFV<3:0>
PFCREG: POLYPHASE FILTER CONFIGURATION REGISTER
(ADDRESS:0x11) (POR:0x38)
W = Writable bit
‘1’ = Bit is set
xtal
R/W-1
MHz/12.8 MHz) * (1 + POLCFV)/8
f
o
= 100 kHz (default)
R/W-1
Preliminary
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
—
r
—
r
© 2010 Microchip Technology Inc.
x = Bit is unknown
—
r
—
r
bit 0