GCLK1 | SYS.CDDIS.0 | OSCIN | SYS.GHVSRC[3:0] | - This the main clock from which HCLK is divided down
- In phase with HCLK
- Is disabled separately from HCLK through the CDDISx registers bit 0
- Can be divided-by-1 up to 8 when running CPU self-test (LBIST) using the CLKDIV field of the STCCLKDIV register at address 0xFFFFE108
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GCLK2 | SYS.CDDIS.0 | OSCIN | SYS.GHVSRC[3:0] | - Always the same frequency as GCLK1
- 2 cycles delayed from GCLK1
- Is disabled along with GCLK1
- Gets divided by the same divider setting as that for GCLK1 when running CPU self-test (LBIST)
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HCLK | SYS.CDDIS.1 | OSCIN | SYS.GHVSRC[3:0] | - Divided from GCLK1 through HCLKCNTL register
- Allowable clock ratio from 1:1 to 4:1
- Is disabled through the CDDISx registers bit 1
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VCLK | SYS.CDDIS.2 | OSCIN | SYS.GHVSRC[3:0] | - Divided down from HCLK through CLKCNTL register
- Can be HCLK/1, HCLK/2,... or HCLK/16
- Is disabled separately from HCLK through the CDDISx registers bit 2
- HCLK:VCLK2:VCLK must be integer ratios of each other
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VCLK2 | SYS.CDDIS.3 | OSCIN | SYS.GHVSRC[3:0] | - Divided down from HCLK
- Can be HCLK/1, HCLK/2,... or HCLK/16
- Frequency must be an integer multiple of VCLK frequency
- Is disabled separately from HCLK through the CDDISx registers bit 3
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VCLK3 | SYS.CDDIS.8 | OSCIN | SYS.GHVSRC[3:0] | - Divided down from HCLK
- Can be HCLK/1, HCLK/2,... or HCLK/16
- Is disabled separately from HCLK through the CDDISx registers bit 8
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VCLKA1 | SYS.CDDIS.4 | VCLK | SYS.VCLKASRC[3:0] | - Defaults to VCLK as the source
- Is disabled through the CDDISx registers bit 4
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VCLKA2 | SYS.CDDIS.5 | VCLK | SYS.VCLKASRC[3:0] | - Defaults to VCLK as the source
- Is disabled through the CDDISx registers bit 5
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VCLKA4 | SYS.CDDIS.11 | VCLK | SYS.VCLKACON1[19:16] | - Defaults to VCLK as the source
- Is disabled through the CDDISx registers bit 11
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VCLKA4_DIVR | SYS.VCLKACON1.20 | VCLK | SYS.VCLKACON1[19:16] | - Divided down from VCLKA4 using the VCLKA4R field of the VCLKACON1 register
- Frequency can be VCLKA4/1, VCLKA4/2, ..., or VCLKA4/8
- Default frequency is VCLKA4/2
- Is disabled separately through the VCLKA4_DIV_CDDIS bit in the VCLKACON1 register, if the VCLKA4 is not already disabled
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RTICLK1 | SYS.CDDIS.6 | VCLK | SYS.RCLKSRC[3:0] | - Defaults to VCLK as the source
- If a clock source other than VCLK is selected for RTICLK1, then the RTICLK1 frequency must be less than or equal to VCLK/3
- Application can ensure this by programming the RTI1DIV field of the RCLKSRC register, if necessary
- Is disabled through the CDDISx registers bit 6
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