AK1544 Datasheet, PDF (19/37 Pages) Asahi Kasei Microsystems – 1300MHz Integer-N Frequency Synthesizer

[AK1544]
○ Examples of writing into registers
(Ex. 1) Power-On ⇒Writing these three-word data is required.
(1) Write a charge pump current value to Address 0x02.
The data at Address 0x02 is not committed to all related circuits at this time. Instead, it is stored in the on-chip
buffer.
(2) Write a division number for the prescaler and a reference counter value to Address 0x03.
The data at the Address 0x03 is not committed to all related circuits at this time. Instead, it is stored in the on-chip
buffer.
(3) Write values for A counter and B counter at the Address 0x01.
The data of these 3 Addresses (0x01, 0x02 and 0x03) are committed to all related circuits at this time.
(Ex. 2) Changing frequency settings
(1) Write values for A counter and B counter at the Address 0x01.
The data of these 3 Addresses (0x01, 0x02 and 0x03) are committed to all related circuits at a time. The latest data
written into Address 0x02 and 0x03 are committed.
(Ex. 3) Changing charge pump current ⇒Writing these two-word data is required.
(1) Write a charge pump current value at the Address 0x02.
The data in Address 0x02 is not committed to all related circuits at this time. Instead, it is stored in the on-chip buffer.
(2) Write values for A counter and B counter at the Address 0x01.
The data of these 3 Addresses (0x01, 0x02 and 0x03) are committed to all related circuits at a time. The latest data
written into Address 0x03 is committed.
(Ex. 4) Changing reference dividing number ⇒Writing these two-word data is required.
(1) Write a division number for the prescaler and a reference counter value at the Address 0x03.
The data at the Address 0x03 is not committed to all related circuits at this time. Instead, it is stored in the on-chip
buffer.
(2) Write values for A counter and B counter at the Address 0x01.
The data of these 3 Addresses (0x01, 0x02 and 0x03) are committed to all related circuits at a time. The latest data
written into Address 0x02 is committed.
MS1350-E-01
19
2013/03