nRF24E2 Nordic VLSI, nRF24E2 Datasheet - Page 18

• Manufacturer Part Number: nRF24E2
• Description: Single Chip RF Transmitter + MCU + ADC NRF2402 2.4GHz RF Transmitter
• Manufacturer: Nordic VLSI

PRODUCT SPECIFICATION
The transmitter is controlled by the RADIO port. The RADIO port uses the address
normally used by port P2 in standard 8051. However since the radio transmitter 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 transmitter
subsystem.
Operation of the transmitter is controlled by SFR registers RADIO and SPI_CTRL:
Table 4-1 : nRF2401 2.4GHz transmitter 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 transmitter
documentation the notation MCU means the onchip 8051 compatible microcontroller.
RADIO register bit
7: PWR_UP, power on radio
6: CE, Activate TX mode
5: Not used
4: Not used
3: CS, Chip select configuration mode
2: Not used
1: CLK1, clock for data input
0: DATA, configuration or TX data input
Table 4-2 : RADIO register - SFR 0xA0, default initial data value is 0x80.
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
A0
B3
This is a write only register, if read, all bits will be undefined
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 transmitter subsystem
01 -> SPI connected to port P1 (boot)
10 -> SPI connected to nRF2401 TX
11 -> reserved, do not use
single chip nRF2401
2.4GHz Transceiver
corresponding pin name on
PWR_UP
CE
CLK2
CS
CLK1
DATA
August 2003