Rainbow-electronics ATmega128RFA1 Manuel d'utilisateur télécharger pdf (Page 294)

294

8266A-MCU Wireless-12/09

ATmega128RFA1

• Bit 5 – ICF4 - Timer/Counter4 Input Capture Flag

The Timer/Counter4 has only limited functionality. It does not have an Input Capture

pin. Therefore this bit has no useful meaning.

• Bit 4 – Res - Reserved Bit

This bit is reserved for future use. A read access always will return zero. A write access

does not modify the content.

• Bit 3 – OCF4C - Timer/Counter4 Output Compare C Match Flag

This flag is set in the timer clock cycle after the counter (TCNT4) value matches the

Output Compare Register C (OCR4C). Note that a Forced Output Compare (FOC4C)

strobe will not set the OCF4C Flag. OCF4C is automatically cleared when the Output

Compare Match C Interrupt Vector is executed. Alternatively, OCF4C can be cleared by

writing a logic one to its bit location.

• Bit 2 – OCF4B - Timer/Counter4 Output Compare B Match Flag

This flag is set in the timer clock cycle after the counter (TCNT4) value matches the

Output Compare Register B (OCR4B). Note that a Forced Output Compare (FOC4B)

strobe will not set the OCF4B Flag. OCF4B is automatically cleared when the Output

Compare Match B Interrupt Vector is executed. Alternatively, OCF4B can be cleared by

writing a logic one to its bit location.

• Bit 1 – OCF4A - Timer/Counter4 Output Compare A Match Flag

This flag is set in the timer clock cycle after the counter (TCNT4) value matches the

Output Compare Register A (OCR4A). Note that a Forced Output Compare (FOC4A)

strobe will not set the OCF4A Flag. OCF4A is automatically cleared when the Output

Compare Match A Interrupt Vector is executed. Alternatively, OCF4A can be cleared by

writing a logic one to its bit location.

• Bit 0 – TOV4 - Timer/Counter4 Overflow Flag

The setting of this flag is dependent of the WGM43:0 bits setting of the Timer/Counter4

Control Register. In Normal and CTC modes, the TOV4 Flag is set when the timer

overflows. TOV4 is automatically cleared when the Timer/Counter4 Overflow Interrupt

Vector is executed. Alternatively, TOV4 can be cleared by writing a logic one to its bit

location.

18.11.46 TCCR5A – Timer/Counter5 Control Register A

Bit 7 6 5 4 3 2 1 0

NA ($120) COM5A1

COM5A0

COM5B1

COM5B0

COM5C1

COM5C0

WGM51 WGM50

TCCR5A

Read/Write RW RW RW RW RW RW RW RW

Initial Value 0 0 0 0 0 0 0 0

• Bit 7:6 – COM5A1:0 - Compare Output Mode for Channel A

The Timer/Counter5 has only limited functionality. Therefore the COM5A1:0 bits do not

control the output compare behavior of any pin. The following table shows the

COM5A1:0 bit functionality when the WGM53:0 bits are set to a normal or a CTC mode

(non-PWM). For the other functionality refer to section "Modes of Operation".

Table 18-24 COM5A Register Bits

COM5A1:0 0 Normal operation

1 2 ... 289 290 291 292 293 294 295 296 297 298 299 ... 523 524

Commentaires sur ces manuels

Pas de commentaire

Rainbow-electronics ATmega128RFA1 Manuel d'utilisateur Page 294

Commentaires sur ces manuels

Produits connexes et manuels pour Capteurs Rainbow-electronics ATmega128RFA1