nRF24E2 Nordic VLSI, nRF24E2 Datasheet - Page 37

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

PRODUCT SPECIFICATION
The nRF24E2 PWM output is a one-channel PWM with a 2 register interface. The
first register, PWMCON, enables PWM function and PWM period length, which is
the number of clock cycles for one PWM period, as shown in the table below. The
other register, PWMDUTY, controls the duty cycle of the PWM output signal. When
this register is written, the PWM signal will change immediately to the new value.
This can result in 4 transitions within one PWM period, but the transition period will
always have a “DC value” between the “old” sample and the “new” sample.
The table shows how PWM frequency (or period length) and PWM duty cycle are
controlled by the settings in the two PWM SFR-registers. For a crystal frequency of
16 MHz, PWM frequency range will be about 1-253 kHz.
PWM is controlled by SFR 0xA9 and 0xAA.
Table 6-1 : PWM control registers - SFR 0xA9 and 0xAA
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
AA
A9
00
01
10
11
R/W
R/W
8
8
;2
;2
;2
0
0
0 (PWM module inactive)
127
255
63
PWMCON
PWMDUTY
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1
1
1
5
5
5
0 :
0 :
0 :
PWM control register
7-6: Enable / period length select
5-0: PWM frequency prescale factor
PWM duty cycle (6 to 8 bits
according to period length)
1
1
1
(see table above)
00: Disable PWM
01: Period length is 6 bit
10: Period length is 7 bit
11: Period length is 8 bit
127
255
63
0
5
6
0 :
0 :
August 2003