nRF24E2 Nordic VLSI, nRF24E2 Datasheet - Page 78

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

PRODUCT SPECIFICATION
- One stop bit
The data bits are transmitted and received LSB first. For transmission, the 9th
bit is determined by the value in TB8. To use the 9th bit as a parity bit, move
the value of the P bit (SFR PSW.0) to TB8.
The mode 2 baud rate is either CPU_clk/32 or CPU_clk/64, as determined by
the SMOD bit. The formula for the mode 2 baud rate is:
2
Baud Rate =
64
Mode 2 operation is identical to the standard 8051.
10.9.3.1 Mode 2 Transmit
Figure 10-14 illustrates the mode 2 transmit timing. Transmission begins after the first
rollover of the divide-by-16 counter following a software write to SBUF . The UART
shifts data out on the txd pin in the following order: start bit, data bits (LSB first), 9th
bit, stop bit. The TI bit is set when the stop bit is placed on the txd pin.
Figure 10-14 : Serial port Mode 2 Transmit Timing
10.9.3.2 Mode 2 Receive
Figure 10-15 illustrates the mode 2 receive timing. Reception begins at the falling
edge of a start bit received on rxd_in, when enabled by the REN bit. For this purpose,
rxd_in is sampled sixteen times per bit for any baud rate.When a falling edge of a start
bit is detected, the divide-by-16 counter used to generate the receive clock is reset to
align the counter rollover to the bit boundaries.
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
August 2003
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