NRF9E5 Datasheet, PDF (80/104 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
CPU_CLK
SCK/T2
TR2
EXEN2
LP_OSC
Divide by 12
Divide by 4
T2M
0
1
C/T2
0
1
clk ⁰
78
15
TL2
TH2
capture
0
78
15
RCAP2L RCAP2H
Divide by 2
EXF2
TF2
INT
Figure 21 Timer 2 – Timer/Counter with Capture.
18.8.3.3 16-Bit Timer/Counter Mode with Capture
The Timer 2 capture mode, illustrated in Figure 21 Timer 2 – Timer/Counter with
Capture, is the same as the 16-bit timer/counter mode, with the addition of the capture
registers and control signals. The CP/RL2 bit in the T2CON SFR enables the capture
feature. When CP/RL2 = 1, a high-to-low transition on t2ex when EXEN2 = 1 causes
the Timer 2 value to be loaded into the capture registers (RCAP2L and RCAP2H).
18.8.3.4 16-Bit Timer/Counter Mode with Auto-Reload
When CP/RL2 = 0, Timer 2 is configured for the auto-reload mode illustrated in Figure
22 Timer 2 – Timer/Counter with Auto-Reload. Control of counter input is the same as
for the other 16-bit counter modes. When the count increments from 0xFFFF, Timer 2
sets the TF2 flag and the starting value is reloaded into TL2 and TH2. The software
must preload the starting value into the RCAP2L and RCAP2H registers.
When Timer 2 is in auto-reload mode, a reload can be forced by a high-to-low transition
on the t2ex pin, if enabled by EXEN2 = 1.
CPU_CLK
SCK/T2
TR2
EXEN2
LP_OSC
Divide by 12
Divide by 4
T2M
0
1
C/T2
0
1
clk ⁰
78
15
TL2
TH2
reload
0
78
15
RCAP2L RCAP2H
Divide by 2
EXF2
TF2
INT
Figure 22 Timer 2 – Timer/Counter with Auto-Reload.
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone [phone] - Fax [phone]
Revision: 1.1
Page 80 of 104
June 2004