mrf89xa Microchip Technology Inc., mrf89xa Datasheet - Page 24

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

2.11.1
Write Register - To write a value into a Configuration
register, the timing diagram illustrated in Figure 2-12
should be followed by the host microcontroller. The
new value of the register is effective from the rising
edge of CSCON.
FIGURE 2-12:
DS70622B-page 24
MRF89XA
Note:
CSCON (In)
SCK (In)
SDI (In)
SDO (Out)
SPI CONFIG
When writing more than one register suc-
cessively, it is not compulsory to toggle
CSCON back high between two write
sequences. The bytes are alternatively
considered as address and value. In this
instance, all new values will become effec-
tive on rising edge of CSCON.
(input)
HZ
* when writing the new value at address A1, the current content of A1 can be read by the µC.
start
1
x
WRITE REGISTER SEQUENCE
rw
2
x
A(4)
3
x
A(3)
Address = A1
4
x
(In)/(Out) refers to MRF89XA side
A(2)
5
x
A(1)
6
x
Preliminary
A(0)
7
x
stop
8
x
D(7) D(6) D(5)
D(7)
9
D(6) D(5)
10
11
Current value at
New value at
address A1
address A1*
D(4) D(3)
D(4) D(3)
12
13
© 2010 Microchip Technology Inc.
D(2) D(1)
D(2) D(1)
14
15
D(0)
16
D(0)
(input)
HZ