RF2051
General Programming Information
Serial Interface
All on-chip registers in the RF2051 are programmed using a 3-wire serial bus which supports both write and read operations.
Synthesizer programming, device configuration and control are achieved through a mixture of hardware and software controls.
Certain functions and operations require the use of hardware controls via the ENBL, MODE, and RESETB pins in addition to
programming via the serial bus.
3-wire bus
ENX
SCLK
SDATA
MCU
RF2051
ENBL
RESETB
MODE
Hardware
Controls
Serial Data Timing Characteristics
RESETB
t1
ENX
t3
t5
SCLK
SDATA
ENBL
t2
t6
t4
t7
X
t8
t9
X
X
X
X
X
X
X
Reset
chip
Initial programming of device
Programming
updates
Parameter
Description
Reset delay
Time
>5ns
>5ns
>5ns
>5ns
>5ns
>5ns
>5ns
>0ns
>0ns
t1
t2
t3
t4
t5
t6
t7
t8
t9
Programming setup time
Programming hold time
ENX setup time
ENX hold time
Data setup time
Data hold time
ENBL setup time
ENBL hold time
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