Texas Instruments OMAP36 Series, Technical Reference Manual

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General-Purpose Timers
Table 16-2. Clock, Power, and Reset Domains for GP Timers
Timer Interface Clock Functional Clock Power Domain
GPTIMER1 WKUP_L4_ICLK GPT1_FCLK WKUP
GPTIMER2 through PER_L4_ICLK GPTx_ALWON_FCLK (x = 2 PER
GPTIMER9 through 9)
GPTIMER10 and 11 CORE_L4_ICLK GPTx_FCLK (x = 10 or 11) CORE
GP timers can be selected as the source of GPTi_FCLK (32-kHz clock or 12, 13, 16.8, 19.2, 26, or 38.4
MHz) at the PRCM level in the corresponding registers. For more information, see
Chapter 3 , Power,
Reset, and Clock Management. Table 16-3 lists the GP timer PRCM clock selection bits.
Table 16-3. GP Timer PRCM Clock Selection Bits
Name Associated PRCM Clock Output Selection Bit
GPT1_FCLK GPT1_FCLK PRCM.CM_CLKSEL_WKUP[0]
CLKSEL_GPT1
PRCM.CM_CLKSEL_PER [0:7]
GPT[2:9]_FCLK GPT[2:9]_ALWON_FCLK
CLKSEL_GPT[2:9]
PRCM.CM_CLKSEL_CORE [6]
GPT10_FCLK GPT10_FCLK
CLKSEL_GPT10
PRCM.CM_CLKSEL_CORE [7]
GPT11_FCLK GPT11_FCLK
CLKSEL_GPT11
From a global system power-management perspective, when one or both of the GP timer clocks is no
longer required, the GP timers can be deactivated at the PRCM level in the corresponding registers.
Table 16-4 lists the GP timer PRCM clock control bits.
Table 16-4. GP Timer PRCM Clock Control Bits
Name Associated PRCM Clock Enable Bit Autoidle Bit
Output
GPT1_FCLK GPT1_FCLK PRCM.CM_FCLKEN_WKUP[0] N/A
EN_GPT1 bit
PRCM.CM_FCLKEN_PER [3:10]
GPT[2:9]_FCLK GPT[2:9]_ALWON_FCLK N/A
EN_GPT[2:9] bit
PRCM.CM_FCLKEN1_CORE [11]
GPT10_FCLK GPT10_FCLK N/A
EN_GPT10 bit
PRCM.CM_FCLKEN1_CORE [12]
GPT11_FCLK GPT11_FCLK N/A
EN_GPT11 bit
GPT1_ICLK PRCM.CM_ICLKEN_WKUP[0] PRCM.CM_AUTOIDLE_WKUP[0]
WKUP_L4_ICLK
EN_GPT1 bit AUTO_GPT1 bit
GPT[2:9]_ICLK PER_L4_ICLK PRCM.CM_ICLKEN_PER[3:10] PRCM.CM_AUTOIDLE_PER[3:10]
EN_GPT[2:9] bit AUTO_GPT[2:9] bit
GPT10_ICLK PRCM.CM_ICLKEN1_CORE[11] PRCM.CM_AUTOIDLE1_CORE[11]
EN_GPT10 bit AUTO_GPT10 bit
CORE_L4_ICLK
GPT11_ICLK PRCM.CM_ICLKEN1_CORE[12] PRCM.CM_AUTOIDLE1_CORE[12]
EN_GPT11 bit AUTO_GPT11 bit
2707 SWPU177N – December 2009 – Revised November 2010 Timers
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