mrf89xa Microchip Technology Inc., mrf89xa Datasheet - Page 26

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

2.11.2
Write Byte (before/during TX) - To write bytes into the
FIFO, the timing diagram illustrated in Figure 2-14
should be followed by the host microcontroller.
FIGURE 2-14:
DS70622B-page 26
MRF89XA
Note:
SCK (In)
SDI (In)
SDO (Out)
CSDAT
HZ
(input)
(In)
SPI DATA
It is compulsory to toggle CSDAT back
high between each byte written. The byte
is pushed into the FIFO on the rising edge
of CSDAT.
D1(7)
x
1
D1(6) D1(5) D1(4) D1(3) D1(2) D1(1)
WRITE BYTES SEQUENCE (EXAMPLE DIAGRAM FOR 2 BYTES)
2
x
3
x
1 st byte written
4
x
x
5
x
6
x
7
x
Preliminary
D1(0)
8
x
(input)
HZ
D2(7) D2(6) D2(5) D2(4) D2(3) D2(2) D2(1) D2(0)
x
1
2
x
3
x
2 nd byte written
4
x
© 2010 Microchip Technology Inc.
5
x
6
x
7
x
8
x
x
HZ
(input)