nRF24E1 Nordic VLSI, nRF24E1 Datasheet - Page 86

• 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
Figure 10-16 : Serial port Mode 3 Transmit Timing
illustrates the mode 3 receive timing.
Figure 10-17
Figure 10-17 : Serial port Mode 3 Receive Timing
The multiprocessor communication feature is enabled in modes 2 and 3 when the
SM2 bit is set in the SCON SFR for a serial port. In multiprocessor communication
mode, the 9th bit received is stored in RB8 and, after the stop bit is received, the serial
port interrupt is activated only if RB8 = 1. A typical use for the multiprocessor
communication feature is when a master wants to send a block of data to one of
several slaves. The master first transmits an address byte that identifies the target
th
slave. When transmitting an address byte, the master sets the 9
bit to 1; for data
bytes, the 9th bit is 0.
When SM2 = 1, no slave will be interrupted by a data byte. However, an address byte
interrupts all slaves so that each slave can examine the received address byte to
determine whether that slave is being addressed. Address decoding must be done by
software during the interrupt service routine. The addressed slave clears its SM2 bit
and prepares to receive the data bytes. The slaves that are not being addressed leave
the SM2 bit set and ignore the incoming data bytes.
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
July 2003
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