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Selected source clock
CM_CLKOUT_CTRL [7]
CLKOUT2_EN
CM_POLCTRL [0]
CLKOUT2_POL
sys_clkout2
Clock
enable
Clock
disable
Clock
disable
Off polarity
switch
Clock
enable
Off polarity
switch
prcm-078
Public Version
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PRCM Basic Programming Model
Figure 3-87. sys_clkout2 Gating Polarity Control
3.6.1.5.2 PRM_POLCTRL (PRM Polarity Control Register)
The PRM polarity control register allows the setting of the polarity of the external signals controlled by the PRM. It contains the following polarity
control bits:
•
OFFMODE_POL: Polarity of sys_off_mode
•
CLKOUT_POL: Polarity of sys_clkout1
•
CLKREQ_POL: Polarity of sys_clkreq
•
EXTVOL_POL: Polarity of both sys_nvmode signals: sys_nvmode1 and sys_nvmode2
At device power up, the reset values of polarity settings are OFFMODE_POL = 1 and CLKREQ_POL = 1. For details about using these signals,
see
, Clock Manager Functional Description.
401
SWPU177N – December 2009 – Revised November 2010
Power, Reset, and Clock Management
Copyright © 2009–2010, Texas Instruments Incorporated