PROGRAMMER’S GUIDE (continued)
ACCESSING THE WRITE–ONLY REGISTERS
ENB
Din
MSB
LSB
CLK
1
2
3
4
8 CLOCKS TO ACCESS THE C REGISTER
16 CLOCKS TO ACCESS THE N REGISTER
24 CLOCKS TO ACCESS THE R REGISTER
= when the PLL frequency synthesizer loads the data bit.
ACCESSING THE READ–ONLY REGISTERS
The Read F Bit or Read A Bit in the C Register must be set to a 1 prior to the following operation
ENB
Dout
MSB
HIGH
IMPEDANCE
CLK
1
2
3
4
DON’T
CARE
LSB X
HIGH
IMPEDANCE
8 CLOCKS TO READ THE A REGISTER WITHOUT READING THE IN D BIT
9 OR 16 CLOCKS TO READ THE A REGISTER INCLUDING THE IN D BIT
24 CLOCKS TO READ THE F REGISTER
= when the PLL frequency synthesizer changes the data bit.
MC145173
24
MOTOROLA