MRF89XAM9A-I/RM Microchip Technology, MRF89XAM9A-I/RM Datasheet - Page 23

• Manufacturer Part Number: MRF89XAM9A-I/RM
• Description: WiFi / 802.11 Modules & Development Tools 915MHz Sub-GHz Transceiver Mod
• Manufacturer: Microchip Technology

Specifications of MRF89XAM9A-I/RM

• Modulation Type: FSK, OOK
• Data Rate Max: 200Kbps
• Sensitivity: -113dBm
• Supply Voltage Range: 2.1V To 3.6V
• Module Interface: SPI, 4-Wire
• Supply Current: 25mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Both of these SPIs are configured in Slave mode while
the host microcontroller is configured as the master.
They have separate selection pins (CSCON and
CSDAT) but share the remaining pins:
• SCK (SPI Clock): Clock signal provided by the
• SDI (SPI Input): Data Input signal provided by the
• SDO (SPI Output): Data Output signal provided
As listed in Table 2-5, only one interface can be
selected at a time with CSCON having the priority:
TABLE 2-5:
All the parameters can be programmed and set through
the SPI module. Any of these auxiliary functions can be
disabled when not required. After power-on, all param-
eters are set to default values. The programmed values
are retained during Sleep mode. The interface supports
the read out of a status register, which provides
detailed information about the status of the transceiver
and the received data.
© 2010 Microchip Technology Inc.
host microcontroller
host microcontroller
by the MRF89XA
CSDAT
0
0
1
1
CONFIG VS. DATA SPI
SELECTION
CSCON
0
1
0
1
CONFIG
CONFIG
DATA
None
SPI
Preliminary
The MRF89XA supports SPI mode 0,0, which requires
the SCK to remain idle in a low state. The CS pins,
/CSCON and /CSDAT based on the mode (pin 14 and
15), must be held low to enable communication
between the host microcontroller and the MRF89XA.
The device’s timing specification details are listed in
Table 5-7. The SDO pin defaults to a high impedance
(hi-Z) state when any of the CS pins are high (the
MRF89XA is not selected). This pin has a tri-state buf-
fer and uses a bus hold logic.
As the device uses byte writes, any of the Chip Select
(CS) pins should be pulled low for 8 bits. Data bits on
the SDI pin (pin 17) are shifted into the device upon the
rising edge of the clock on the SCK pin (pin 18) when-
ever the CS pins are low. The maximum clock fre-
quency for the SPI clock for CONFIG mode is 6 MHz.
However, maximum SPI Clock for DATA mode (to
read/write FIFO) is 1 MHz. Data is received by the
transceiver through the SDI pin and is clocked on the
rising edge of SCK. The MRF89XA sends the data
through the SDO pin and is clocked out on the falling
edge of SCK. The Most Significant bit (MSb) is sent first
in any data.
The SPI sequence diagrams are illustrated in
Figure 2-12 through Figure 2-15.
MRF89XA
DS70622B-page 23