NRF9E5 NORDIC SEMICONDUCTOR, NRF9E5 Datasheet - Page 81

• Manufacturer Part Number: NRF9E5
• Description: TRX, 430-928MHZ, MCU/ADC/PWM, SMD
• Manufacturer: NORDIC SEMICONDUCTOR

Specifications of NRF9E5

• Receiving Current: 12.5mA
• Transmitting Current: 30mA
• Data Rate: 50Kbps
• Frequency Range: 430MHz To 928MHz
• Modulation Type: GFSK
• Rf Ic Case Style: QFN
• No. Of Pins: 32
• Supply Voltage Range: 1.9V To
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PRODUCT SPECIFICATION
nRF9E5 Single Chip Transceiver with Embedded Microcontroller and ADC
18.8.3.1 Timer 2 Mode Control
Table 69 summarizes how the SFR bits determine the Timer 2 mode.
18.8.3.2 16-Bit Timer/Counter Mode
Figure 21 Timer 2 – Timer/Counter with Capture illustrates how Timer 2 operates in
timer/counter mode with the optional capture feature. The C/T2 bit determines whether
the 16-bit counter counts clock cycles (divided by 4 or 12), or high-to-low transitions on
the T2 pin. The TR2 bit enables the counter. When the count increments from 0xFFFF,
the TF2 flag is set.
*
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone [phone] - Fax [phone]
Revision: 1.3
Bit
T2CON.3
T2CON.2
T2CON.1
T2CON.0
T2CON.7
T2CON.6
T2CON.5
T2CON.4
See chapter 16.2 for t2ex definition.
RCLK
0
0
1
X
X
Function
EXEN2 - Timer 2 external enable. EXEN2 = 1 enables capture or reload to occur as a result
of a high-to-low transition on t2ex
port. EXEN2 = 0 causes Timer 2 to ignore all external events at t2ex.
TR2 - Timer 2 run control flag. TR2 = 1 starts Timer 2. TR2 = 0 stops Timer 2.
C/T2 - Counter/timer select. C/T2 = 0 selects a timer function for Timer 2. C/T2 = 1 selects
a counter of falling transitions on the T2 pin. When used as a timer, Timer 2 runs at four
clocks per increment or twelve clocks per increment as programmed by CKCON.5, in all
modes except baud-rate generator mode. When used in baud-rate generator mode, Timer 2
runs at two clocks per increment, independent of the state of CKCON.5.
CP/RL2 - Capture/reload flag. When CP/RL2 = 1, Timer 2 captures occur on high-to-low
transitions of t2ex
overflows or when high-to-low transitions occur on t2ex, if EXEN2 = 1. If either RCLK or
TCLK is set to 1, CP/RL2 will not function, and Timer 2 will operate in auto-reload mode
following each overflow.
TCLK - Transmit clock flag. Determines whether Timer 1 or Timer 2 is used for Serial port
0xFFFF. TF2 must be cleared to 0 by the software. TF2 will only be set to a 1 if RCLK and
by a high-to-low transition on the t2ex
RCLK - Receive clock flag. Determines whether Timer 1 or Timer 2 is used for Serial port
EXF2 - Timer 2 external flag. Hardware will set EXF2 when a reload or capture is caused
timing of received data in serial mode 1 or 3. RCLK = 1 selects Timer 2 overflow as the
timing of transmit data in serial mode 1 or 3. TCLK =1 selects Timer 2 overflow as the
TCLK are both cleared to 0. Writing a 1 to TF2 forces a Timer 2 interrupt if enabled.
TF2 - Timer 2 overflow flag. Hardware will set TF2 when Timer 2 overflows from
TCLK
0
0
X
1
X
by the software. Writing a 1 to EXF2 forces a Timer 2 interrupt if enabled.
transmit clock. TCLK = 0 selects Timer 1 overflow as the transmit clock.
receive clock. RCLK = 0 selects Timer 1 overflow as the receive clock.
Table 69 Timer 2 Mode Control Summary.
Table 68 T2CON Register – SFR 0xC8.
CP/RL2
1
0
X
X
X
*
if EXEN2 = 1. When CP/RL2 = 0, auto-reloads occur when Timer 2
TR2
1
1
1
1
0
Page 81 of 108
*
, if Timer 2 is not generating baud rates for the serial
*
, pin, and EXEN2 is set. EXF2 must be cleared to 0
Mode
16-bit timer/counter with capture
16-bit timer/counter with auto-reload
Baud-rate generator
Baud-rate generator
Off
June 2006