NRF9E5 Datasheet, PDF (83/104 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
The serial mode 0 baud rate is either CPU_clk/12 or CPU_clk/4, depending on the state
of the SM2. When SM2 = 0, the baud rate is CPU_clk/12; when SM2 = 1, the baud rate
is CPU_clk/4.
Mode 0 operation is identical to the standard 8051. Data transmission begins when an
instruction writes to the SBUF SFR. The UART shifts the data out, LSB first, at the
selected baud rate, until the 8-bit value has been shifted out.
Mode 0 data reception begins when the REN bit is set and the RI bit is cleared in the
corresponding SCON SFR. The shift clock is activated and the UART shifts data in on
each rising edge of the shift clock until eight bits have been received. One machine cycle
after the 8^th bit is shifted in, the RI bit is set and reception stops until the software clears
the RI bit.
Figure 24 Serial Port Mode 0 receive timing for low-speed (CPU_clk/12) operation.
Figure 25 Serial Port Mode 0 receive timing for high-speed (CPU_clk/4) operation.
:
Figure 26 Serial Port Mode 0 transmit timing for high-speed (CPU_clk/4) operation.
:
Figure 27 Serial Port Mode 0 transmit timing for high-speed (CPU_clk/4) operation.
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone [phone] - Fax [phone]
Revision: 1.1
Page 83 of 104
June 2004