PC87591L datasheet(141/437 Pages) NSC

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Embedded Controller Modules (Continued)

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4.7.5

Timer I/O Functions

There are two I/O pins associated with each of the MFT16 modules: TAn and TBn, where n denotes the module on a given

device. The functionality of TA and TB depends on the mode of operation and the value of TAEN and TBEN bits. Table 20

shows the function of TA and TB versus the selected mode of operation. Note that if TA functions as a PWM output, the

initial and present value of TA is defined by TAOUT. For example, to start with TA high, TAOUT must be set (1) prior to

enabling the timer clock.

4.7.6

Operation in Development System

The MFT16 supports freezing the counters during breakpoints while operating in development systems. If FREEZE bit is

asserted, all timer counter clocks are inhibited, and the current values of timer/counter registers TnCNT1 and TnCNT2 are

frozen. Once FREEZE becomes inactive, counting resumes from the previous value. See 4.20.5 on page 273 for more de-

tails.

Table 20. MFT16 I/O Functions

I/O

TnAEN

TnBEN

Mode 1

Mode 2

Mode 3

Mode 4

PWM and Counter

Dual Input Capture

Dual Independent

Timer

Input Capture and

Timer

TAn

TnAEN=0

TnBEN=X

No Output

Capture TnCNT1

into TnCRA

No Output toggle

TnAEN=1

TnBEN=X

Toggle Output on

underﬂow of TnCNT1

Capture TnCNT1

into TnCRA and

preset TnCNT1

Toggle Output on

underﬂow of TnCNT1

Toggle Output on

underﬂow of TnCNT1

TBn

TnAEN=X

TnBEN=0

Ext. Event or Pulse

Accumulate Input

Capture TnCNT1

into TnCRB

Ext. Event or Pulse

Accumulate Input

Capture TnCNT2

into TnCRB

TnAEN=X

TnBEN=1

Ext. Event or Pulse

Accumulate Input

Capture TnCNT1

into TnCRB and

preset TnCNT1

Ext. Event or Pulse

Accumulate Input

Capture TnCNT2

into TnCRB and

preset TnCNT2

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