NRF9E5 Datasheet, PDF (20/104 Pages) List of Unclassifed Manufacturers – 433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC

PRODUCT SPECIFICATION
nRF9 E5 Single Chip Transceiver with Embedded Microcontroller and ADC
8.1.1 Controlling the Transceiver via SPI Interface.
Normally the SPI hardware interface rather than GPIO programming will do the data
transfers to the transceiver. Please see Table 33 SPI control and data SFR-registers for
use of SPI interface. When SPI_CTRL is ‘0x’, all radio pins are connected directly to
their respective port pins and the SPI functionality may be implemented in software.
P2 register
Read
AM
CD
DR
EOC
SBMISO
bit
Write
7
6
5 TRX_CE
4
TX_EN
3
SBCSN
2
1 SBMOSI
0
SBSCK
SPI Hardware
datain
dataout
clock
SPI_CTRL==1x
1
MUX
0
1
MUX
0
0
MUX
1
nRF905/AD
TRX_CE
TX_EN
CSN
EOC
AM
CD
DR
MOSI
SCK
from IO-pin
MISO
Figure 4 Transceiver interface.
8.1.2 P2 Port Behavior During RESET
During the period the internal reset is active (regardless of whether or not the clock is
running), the P2 outputs that control the nRF905 transceiver subsystem are forced to
their respective default values. When program execution starts, these ports will remain at
those default levels until the programmer actively changes them by writing to the P2
register.
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone [phone] - Fax [phone]
Revision: 1.1
Page 20 of 104
June 2004