PIC24F08KL301-I/SS【PDF 158/260 页】IC MCU 16BIT 8KB FLASH 20-SSOP

CHAPTER 7 16-BIT TIMER/EVENT COUNTERS 0 AND 1

User’s Manual U15905EJ2V1UD

238

7.7

Cautions

Various cautions concerning the 16-bit timer/event counter are shown below.

(1) If a conflict occurs between the reading of the CCn0 register and a capture operation when the CCn0 register

is used in capture mode, an external trigger (INTPn0) valid edge is detected and an external interrupt request

signal (INTCCn0) is generated, however, the timer value is not stored in the CCn0 register.

(2) If a conflict occurs between the reading of the CCn1 register and a capture operation when the CCn1 register

is used in capture mode, an external trigger (INTPn1) valid edge is detected and an external interrupt request

signal (INTCCn1) is generated, however, the timer value is not stored in the CCn1 register.

(3) The following bits and registers must not be rewritten during operation (TMCEn = 1).

CSn2 to CSn0 bits of TMCn0 register

TMCn1 register

SESn register

(4) The TMCAEn bit of the TMCn0 register is a TMn reset signal. To use TMn, first set (1) the TMCAEn bit.

(5) The analog noise elimination time + two cycles of the input clock are required to detect the valid edge of the

external interrupt request signal (INTPn0 or INTPn1) or the external clock input (TIn).

Therefore, edge

detection will not be performed normally for changes that are less than the analog noise elimination time + two

cycles of the input clock. Only two clocks of fXX are required for detection of the internal clear input (TCLR1n)

valid edge.

(6) The operation of an external interrupt request signal (INTCCn0 or INTCCn1) is automatically determined

according to the operating state of the capture/compare register. When the capture/compare register is used

for a capture operation, the external interrupt request signal is used for valid edge detection. When the

capture/compare register is used for a compare operation, the external interrupt request signal is used for an

interrupt indicating a match with the TMn register.

(7) If the ENTOn and ALVn bits are changed at the same time, a glitch (spike shaped noise) may be generated in

the TOn pin output. Either create a circuit configuration that will not malfunction even if a glitch is generated or

make sure that the ENTOn and ALVn bits are not changed at the same time.

Remark

n = 0, 1

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