AT89LP428 datasheet(64/149 Pages) ATMEL

64 / 149 page

3654A–MICRO–8/09

AT89LP428/828

Notes:

1. All writes/reads to/from T2CCC will access channel X as currently selected by T2CCA.The control registers for the remain-

ing unselected channels are not accessible.

2. Analog Comparator A events are determined by the CMA2-0 bits in ACSRA. See Table 18-1 on page 102.

3. Analog Comparator B events are determined by the CMB

2-0 bits in ACSRB. See Table 18-2 on page 103.

4. Asymmetrical versus Symmetrical PWM is determined by the Timer 2 Count Mode. See “Pulse Width Modulation Mode” on

page 68.

Table 13-4.

T2CCC – Timer/Counter 2 Compare/Capture Control

T2CCC Address = 0D4H

Reset Value = 00X0 0000B

Not Bit Addressable

CIENx

CDIRx

–CTCx

CCMx

CxM2

CxM1

CxM0

Bit

654

321

Symbol

Function

CIENx

Channel X Interrupt Enable. When set, channel X’s interrupt flag, CCFx in T2CCF, will generate an interrupt when

ECC = 1. Clear to disable interrupts from channel X.

CDIRx

Channel X Capture Direction. In dual-slope modes, a compare/capture event on channel X will store the current count

direction into CDIRx. Up-counting = 0 and down-counting = 1. Modifying this bit has no effect.

CTCx

Clear Timer on Compare/Capture of Channel X. When set, the Timer 2 registers TL2 and TH2 will be cleared by a

compare/capture event on channel X. When cleared, Timer 2 is unaffected by channel X events.

CCMx

Channel X Compare/Capture Mode. When CCMx = 1, channel X operates in compare mode. When CCMx = 0, channel

X operates in capture mode.

CxM

[2 - 0]

Channel X Mode. Selects the output/input events for compare/capture channel X.

CxM2

CxM1

CxM0

Capture Event (CCMx = 0)

000

Disabled

Trigger on negative edge of CCx pin

Trigger on positive edge of CCx pin

Trigger on either edge of CCx pin

Trigger on Timer 0 overflow

Trigger on Timer 1 overflow

Trigger on Analog Comparator A Event(2)

Trigger on Analog Comparator B Event(3)

CxM2

CxM1

CxM0

Compare Action (CCMx = 1)

000

Output disabled (interrupt only)

001

Set CCx pin on compare match

010

Clear CCx pin on compare match

Toggle CCx pin on compare match

100

Inverting Pulse Width Modulation(4)

Non-inverting Pulse Width Modulation(4)

110

Reserved

111

Reserved

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