Capture-3 Register (Cap3); Capture-4 Register (Cap4); Ecap Control Register 1 (Ecctl1); Capture-3 Register (Cap3) Field Descriptions - Texas Instruments Concerto F28M35 Series Technical Reference Manual

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Capture Module - Control and Status Registers

In APWM mode, writing to CAP1/CAP2 active registers also writes the same value to the

corresponding shadow registers CAP3/CAP4. This emulates immediate mode. Writing to the

shadow registers CAP3/CAP4 invokes the shadow mode.

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

C28 Enhanced Capture (eCAP) Module

Figure 8-15. Capture-3 Register (CAP3)

Table 8-5. Capture-3 Register (CAP3) Field Descriptions

In CMP mode, this is a time-stamp capture register. In APWM mode, this is the period shadow

(APRD) register. You update the PWM period value through this register. In this mode, CAP3

(APRD) shadows CAP1.

Figure 8-16. Capture-4 Register (CAP4)

Table 8-6. Capture-4 Register (CAP4) Field Descriptions

In CMP mode, this is a time-stamp capture register. In APWM mode, this is the compare shadow

(ACMP) register. You update the PWM compare value via this register. In this mode, CAP4

(ACMP) shadows CAP2.

Figure 8-17. ECAP Control Register 1 (ECCTL1)

Table 8-7. ECAP Control Register 1 (ECCTL1) Field Descriptions

Emulation Control

TSCTR counter stops immediately on emulation suspend

TSCTR counter runs until = 0

TSCTR counter is unaffected by emulation suspend (Run Free)

Event Filter prescale select

Divide by 1 (i.e,. no prescale, by-pass the prescaler)

SPRUH22I – April 2012 – Revised November 2019

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