NRF9E5 Datasheet, PDF (85/104 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
Desired
Baud Rate
19.2 Kb/s
9.6 Kb/s
4.8 Kb/s
0.4 Kb/s
1.2 Kb/s
SMOD
C/T
1
0
1
0
1
0
1
0
1
0
Timer 1
Mode
2
2
2
2
2
TH1 Value
for 16 MHz
CPU clk
0xF3
0xE6
0XcC
0x98
0x30
TH1 Value
for 8 MHz
CPU clk
-
0xF3
0xE6
0xCC
0x98
Table 72 Timer 1 Reload Values for Serial Port Mode 1 Baud Rates.
To use Timer 2 as the baud-rate generator, configure Timer 2 in auto-reload mode and
set the TCLK and/or RCLK bits in the T2CON SFR. TCLK selects Timer 2 as the baud-
rate generator for the transmitter; RCLK selects Timer 2 as the baud-rate generator for
the receiver. The 16-bit reload value for Timer 2 is stored in the RCAP2L and RCA2H
SFRs, which makes the equation for the Timer 2 baud rate:
Baud Rate =
clk
32 x (65536 - {RCAP2H, RCAP2L})
where RCAP2H,RCAP2L is the content of RCAP2H and RCAP2L taken as a 16-bit
unsigned number. The 32 in the denominator is the result of the CPU_clk signal being
divided by 2 and the Timer 2 overflow being divided by 16. Setting TCLK or RCLK to
1 automatically causes the CPU_clk signal to be divided by 2, as shown in Figure 23
Timer 2 – Baud Rate Generator Mode, instead of the 4 or 12 determined by the T2M bit
in the CKCON SFR.
To derive the required RCAP2H and RCAP2L values from a known baud rate, use the
equation:
RCAP2H,RCAP2L = 65536 –
clk
32 x Baud Rate
Table Table 73 lists sample values of RCAP2L and RCAP2H for a variety of
desired baud rates.
Baud Rate
57.6 Kb/s
19.2 Kb/s
9.6 Kb/s
4.8 Kb/s
0.4 Kb/s
1.2 Kb/s
C/T 16 MHz CPU clk
2 _RCAP2H
RCAP2L
0 0xFF
0xF7
0 0xFF
0xE6
0 0xFF
0xCC
0 0xFF
0x98
0 0xFF
0x30
0 0xFE
0x5F
Table 73 Timer 2 Reload Values for Serial Port Mode 1 Baud Rates.
When either RCLK or TCLK is set, the TF2 flag will not be set on a Timer 2
rollover, and the t2ex reload trigger is disabled.
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone [phone] - Fax [phone]
Revision: 1.1
Page 85 of 104
June 2004