Datasheet

ECAPx
(x = 1, 2, 3, 4, 5, or 6)
eCAPx
double
sync
(x = 1 through 6)
6 VCLK3
Cycles Filter
160
RM57L843
SPNS215C –FEBRUARY 2014–REVISED JUNE 2016 www.ti.com
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Peripheral Information and Electrical Specifications Copyright © 2014–2016, Texas Instruments Incorporated
Figure 7-5 shows the detailed input synchronization selection (asynchronous, double-synchronous, or
double synchronous + filter width) for eCAPx.
Figure 7-5. eCAPx Input Synchronization Selection Detail
7.2.1 Clock Enable Control for eCAPx Modules
Each of the eCAPx modules has a clock enable (ECAPxENCLK) which is controlled by its respective
Peripheral Power Down bit in the PSPWRDWNCLRx register of the PCR2 module. To properly reset the
peripherals, the peripherals must be released from reset by setting the PENA bit of the CLKCNTL register
in the system module. In addition, the peripherals must be released from their power down state by
clearing the respective bit in the PSPWRDWNCLRx register. By default, after reset, the peripherals are in
the power down state.
Table 7-7. eCAPx Clock Enable Control
eCAP MODULE INSTANCE
CONTROL REGISTER TO
ENABLE CLOCK
DEFAULT VALUE
eCAP1 PSPWRDWNCLR3[15] 1
eCAP2 PSPWRDWNCLR3[8] 1
eCAP3 PSPWRDWNCLR3[9] 1
eCAP4 PSPWRDWNCLR3[10] 1
eCAP5 PSPWRDWNCLR3[11] 1
eCAP6 PSPWRDWNCLR3[4] 1
(1) The filter width is 6 VCLK3 cycles.
7.2.2 PWM Output Capability of eCAPx
When not used in capture mode, each of the eCAPx modules can be used as a single-channel PWM
output. This is called the Auxiliary PWM (APWM) mode of operation of the eCAPx modules. For more
information, see the eCAP module chapter of the device-specific TRM.
7.2.3 Input Connection to eCAPx Modules
The input connection to each of the eCAPx modules can be selected between a double-VCLK3-
synchronized input or a double-VCLK3-synchronized and filtered input, as listed in Table 7-8.
Table 7-8. Device-Level Input Connection to eCAPx Modules
INPUT SIGNAL
CONTROL FOR
DOUBLE-SYNCHRONIZED
CONNECTION TO eCAPx
CONTROL FOR
DOUBLE-SYNCHRONIZED AND
FILTERED CONNECTION TO eCAPx
(1)
eCAP1 PINMMR169[2:0] = 001 PINMMR169[2:0] = 010
eCAP2 PINMMR169[10:8] = 001 PINMMR169[10:8] = 010
eCAP3 PINMMR169[18:16] = 001 PINMMR169[18:16] = 010
eCAP4 PINMMR169[26:24] = 001 PINMMR169[26:24] = 010
eCAP5 PINMMR170[2:0] = 001 PINMMR170[2:0] = 010
eCAP6 PINMMR170[10:8] = 001 PINMMR170[10:8] = 010