12.3.6 Clock Generator Divider Register
Note: The FRC/BFRC variants of the CLKGEN2/3 do not implement the
clock divider; the divider ratio for the FRC CLKFEN is fixed at 1x. The associated
FRACDIV macro has an active register that contains the current value of INTDIV[14:0]
and FRACDIV[8:0]. The CLKxDIV contents are transferred into the FRACDIV macro active
registers after the associated DIVSWEN bit is set. The DIVSWEN bit is cleared when
the transfer is completed.
| Name: | CLKxDIV |
| Offset: | 0x311C, 0x3124, 0x312C, 0x3134, 0x313C, 0x3144, 0x314C, 0x3154, 0x315C, 0x3164, 0x316C, 0x3174, 0x317C, 0x3184 |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| INTDIV[14:8] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | ||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| INTDIV[7:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| FRACDIV[8:1] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| FRACDIV[0] | |||||||||
| Access | R/W | ||||||||
| Reset | 0 |
Bits 30:16 – INTDIV[14:0] Integer Divider bits
Number of Source Clocks in each 1/2 period of the Divided Clock.
Period Ex:
Divided Clock Period = [Source Clock Period] * INT * 2
Frequency Ex:
111111111111111 = Clock Generator
Divided Clock = Source Clock divided by 65,534
(32,767 *2)
111111111111110 = Clock Generator Divided Clock
Clock = Source Clock divided by 65,532
(32,766 *2)
| Value | Description |
|---|---|
| 000000000000011 | Clock Generator Divided Clock = Source Clock divided by 6 (3*2) |
| 000000000000010 | Clock Generator Divided Clock = Source Clock divided by 4 (2*2) |
| 000000000000001 | Clock Generator Divided Clock = Source Clock divided by 2 (1*2) |
| 000000000000000 | Clock Generator Divided Clock = Source Clock (no divider) |
Bits 15:7 – FRACDIV[8:0] Fractional Divider bits
Provides fractional additive value for 1/2 period of the output clock.
| Value | Description |
|---|---|
| 1111_1111_0 | 510/512 (0.99609375) divisor added to Integer value |
| 1111_1111_1 | 511/512 (0.998046875) divisor added to Integer value |
| 100000000 | 256/512 (0.5000) divisor added to Integer value |
| 0000_0001_0 | Clock Generator Divided Clock = Source Clock divided by 6 (3*2) |
| 0000_0000_1 | Clock Generator Divided Clock = Source Clock divided by 4 (2*2) |
| 0000_0000_0 | Clock Generator Divided Clock = Source Clock divided by 2 (1*2) |