nRF24E1 Nordic VLSI, nRF24E1 Datasheet - Page 17

• Manufacturer Part Number: nRF24E1
• Description: 2.4Ghz RF Transceiver With Embedded 8051 Compatible Microcontroller And 9 Input, 10 Bit ADC
• Manufacturer: Nordic VLSI

PRODUCT SPECIFICATION
The transceiver is controlled by the RADIO port. The RADIO port uses the address
normally used by port P2 in standard 8051. However since the radio transceiver is on
chip, the port is not bi-directional. The power on default values in the port “latch” also
differs from traditional 8051 to match the requirements of the radio transceiver
subsystem.
Operation of the transceiver is controlled by SFR registers RADIO and SPI_CTRL:
Table 4-1 : nRF2401 2.4GHz transceiver subsystem control registers - SFR 0xA0 and
0xB3
The bits of the RADIO register correspond to similar pins of the nRF2401 single chip,
as shown in Table 4-2 : RADIO register . In the documentation the pin names are
used, so please note that setting or reading any of these nRF2401 pins, means to write
or read the RADIO SFR register accordingly. Please also note that in the transceiver
documentation the notation MCU means the onchip 8051 compatible microcontroller.
RADIO register bit
7: 0 (not used)
6: DR2, data ready from receiver 2 (available also
5: CLK2, clock for receiver 2 data out
4: DOUT2, data out from receiver 2
3: 0 (not used)
2: DR1, data ready from receiver 1 (available also
1: CLK1, clock for receiver 1 data out
0: DATA, data out from receiver 1
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
A0
B3
as interrupt)
as interrupt)
R/W
R/W
8
2
80
0
RADIO
SPI_CTRL
Qhtrà &ÂsÃ(&
00 -> SPI not used
General purpose IO for interface to
nRF2401 radio transceiver subsystem
01 -> SPI connected to port P1 (boot)
10 -> SPI connected to nRF2401 CH1
11 -> SPI connected to nRF2401 RX
CH2
single chip nRF2401
2.4GHz Transceiver
DR2
DR1
corresponding pin name on
CLK2
DOUT2
CLK1
DATA
July 2003