DS20006554A datasheet(58/94 Pages) MICROCHIP

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ZL30260-ZL30263

Data Sheet

DS20006554A

AFBBP

APLL Feedback Divider Truncate Bit Position

114h

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Name

AFBBP[7:0]

Default

Bits 7 to 0: APLL Feedback Divider Truncate Bit Position (AFBBP[7:0]). This unsigned integer specifies the

number of fractional bits that are valid in the AFBDIV value. There are 33 fractional bits in AFBDIV. The value in this

AFBBP field specifies 33

– number_of_valid_AFBDIV_fractional_bits. When AFBBP=0 all 33 AFBDIV fractional bits

are valid. When AFBBP=9, the most significant 24 AFBDIV fractional bits are valid and the least significant 9 bits

must be set to 0. This register field is only used when the feedback divider value is expressed in the form AFBDIV +

AFBREM / AFBDEN. AFBBP values greater than 33 are invalid. See section 5.5.4.

AIDCR

APLL Frequency Increment-Decrement Configuration Register

115h

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Name

DECF

FDSS[2:0]

INCF

FISS[2:0]

Default

Bit 7: Decrement Frequency (DECF). When FDSS=000, this bit is the APLL frequency decrement control signal.

See section 5.5.7.

Bits 6 to 4: Frequency Decrement Source Select (FDSS[2:0]). This field specifies the APLL frequency decrement

control signal. Every low-to-high transition and every high-to-

low transition of the signal decrements the APLL’s

output frequency by the amount specified by AID[23:0] x 27. See section 5.5.7.

000 = DECF bit

001 = GPIO0

010 = GPIO1

011 = GPIO2

100 = GPIO3

101 to 111 = {unused values}

Bit 3: Increment Frequency (INCF). When FISS=000, this bit is the APLL frequency increment control signal. See

section 5.5.7.

Bits 2 to 0: Frequency Increment Source Select (FISS[2:0]). This field specifies the APLL frequency increment

control signal. Every low-to-high transition and every high-to-low

transition of the signal increments the APLL’s output

frequency by the amount specified by AID[23:0] x 27. See section 5.5.7.

000 = INCF bit

001 = GPIO0

010 = GPIO1

011 = GPIO2

100 = GPIO3

101 to 111 = {unused values}

DS20006554A Datasheet(PDF) 58 Page - Microchip Technology

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