TMS570LS1227 Datasheet, PDF (124/184 Pages) Texas Instruments – TMS570LS1227 16- and 32-Bit RISC Flash Microcontroller

TMS570LS1227
SPNS192B – OCTOBER 2012 – REVISED FEBRUARY 2015
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ePWM Module Instance
eCAP1
eCAP2
eCAP3
eCAP4
eCAP5
eCAP6
Table 7-7. eCAPx Clock Enable Control
Control Register to Enable Clock
PINMMR39[0]
PINMMR39[8]
PINMMR39[16]
PINMMR39[24]
PINMMR40[0]
PINMMR40[8]
Default Value
1
1
1
1
1
1
The default value of the control registers to enable the clocks to the eCAPx modules is 1. This means that
the VCLK4 clock connections to the eCAPx modules are enabled by default. The application can choose
to gate off the VCLK4 clock to any eCAPx module individually by clearing the respective control register
bit.
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 eCAP modules. Refer to the
eCAP chapter of the TMS570LS12x/11x Technical Reference Manual (SPNU515) for more information.
7.2.3 Input Connection to eCAPx Modules
The input connection to each of the eCAP modules can be selected between a double-VCLK4-
synchronized input or a double-VCLK4-synchronized and filtered input, as shown in Table 7-8.
Input Signal
eCAP1
eCAP2
eCAP3
eCAP4
eCAP5
eCAP6
Table 7-8. Device-Level Input Connection to eCAPx Modules
Control for Double-Synchronized Connection to
eCAPx
PINMMR43[0] = 1
PINMMR43[8] = 1
PINMMR43[16] = 1
PINMMR43[24] = 1
PINMMR44[0] = 1
PINMMR44[8] = 1
Control for Double-Synchronized and Filtered
Connection to eCAPx
PINMMR43[0] = 0 AND PINMMR43[1] = 1
PINMMR43[8] = 0 AND PINMMR43[9] = 1
PINMMR43[16] = 0 AND PINMMR43[17] = 1
PINMMR43[24] = 0 AND PINMMR43[25] = 1
PINMMR44[0] = 0 AND PINMMR44[1] = 1
PINMMR44[8] = 0 AND PINMMR44[9] = 1
7.2.4 Enhanced Capture Module (eCAP) Timings
t_w(CAP)
PARAMETER
Capture input pulse width
Table 7-9. eCAPx Timing Requirements
TEST CONDITIONS
Synchronous
Synchronous, with input
filter
MIN
2 t_c(VCLK4)
2 t_c(VCLK4) + filter width
MAX
UNIT
cycles
cycles
t_w(APWM)
Table 7-10. eCAPx Switching Characteristics
PARAMETER
TEST CONDITIONS
MIN
Pulse duration, APWMx output high or low
20
MAX
UNIT
ns
124 Peripheral Information and Electrical Specifications
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