nRF24E1 Nordic VLSI, nRF24E1 Datasheet - Page 55

• Manufacturer Part Number: nRF24E1
• Description: 2.4Ghz RF Transceiver With Embedded 8051 Compatible Microcontroller And 9 Input, 10 Bit ADC
• Manufacturer: Nordic VLSI

PRODUCT SPECIFICATION
Note : Before accessing the CK_CTRL register, make sure that the busy bit of
RTC/Watchdog SFR 0xAD, bit 4 (page 52) is not set
Bit
CK_CTRL .0
CK_CTRL .1
Table 9-2 : CK_CTRL register - SFR 0xB6
Startup time consists of a number of LP_OSC cycles + a number of XTAL clock
cycles. f
measured as described on page 50. f
on page 91. Because frequency f
f
Startup times are summarized in the table below :
Reason of startup
Power-on reset
Watchdog reset
External interrupt
RTC interrupt
Table 9-4 : Startup times from Power down mode
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
LP_OSC.
LP_OSC
may vary from 1 to 5.5kHz over voltage and temperature, but can be
Function
Not used
STOP_CLOCK. Setting the STOP_CLOCK
bit places the nRF24E1 in power down mode.
Startup time
14-15
12
3-4
3
in f
LP_OSC
cycles
XTAL
XTAL
is much higher, startup time is dominated by
QhtrÃ$$ÂsÃ(&
Startup time
max 52,
see ch. 7.6
max 52
see ch. 7.6
depends on the selected crystal, as described
24
24
in f
XTAL
cycles
Example of total
startup time
1.2 ms
1.0 ms
4.8 ms
4.0 ms
if f
if f
LP_OSC
XTAL
=16MHz
=3kHz
July 2003