nRF24E1 Nordic VLSI, nRF24E1 Datasheet - Page 52

• 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
running on the slow LP_OSC clock. The 16-bit register {REGX_MSB, REGX_LSB}
can be written or read as two bytes from the CPU. Typical sequences are:
Note : please also wait until not busy before accessing SFR 0xB6 CK_CTRL (page
55)
Table 8-2 : RTC and Watchdog SFR-registers
nRF24E1 can be reset either by the on-chip power-on reset circuitry or by the on-chip
watchdog counter.
The power-on reset circuitry keeps the chip in power-on-reset state until the supply
voltage reaches VDDmin. At this point the internal voltage generators and oscillators
start up, the SFRs are initialized to their reset values, as listed in Table 10-10, and
thereafter the CPU begins program execution at the standard reset vector address
0x0000. The startup time from power-on reset is about 14 LP_OSC cycles, which in
total may vary from 3 to 15ms depending on processing, temperature and supply
voltage.
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
AD
AB
AC
Wait until not busy.
Wait until not busy.
Write REGX_MSB, Write REGX_LSB, Write REGX_CTRL
Write REGX_CTRL, Wait until not busy.
Read REGX_MSB, Read REGX_LSB
R/W
R/W
R/W
8
8
5
0
0
0
REGX_
MSB
REGX_
LSB
REGX_
CTRL
QhtrÃ$!ÂsÃ(&
Most significant part of 16 bit register for
interface to Watchdog and RTC
Least significant part of 16 bit register for
interface to Watchdog and RTC
Control for 16 bit register for interface to
Watchdog and RTC. Bit 4 is only available
on read and is used to flag the interface unit
as busy.
Bits 3:0 is read/write with the encoding:
0 000: Read from WD register (16 bit)
1 000: Write to WD register (16 bit)
0 010: Read from RTC latch register (16 bit)
1 010: Write to RTC latch register (16 bit)
0 011: Read from RTC counter reg. (16 bit)
1 011: Disable RTC counter (no data)
July 2003