AT89LP428 datasheet(63/149 Pages) ATMEL

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3654A–MICRO–8/09

AT89LP428/828

Note:

All writes/reads to/from T2CCH will access channel X as currently selected by T2CCA.The data registers for the remaining

unselected channels are not accessible.

Note:

All writes/reads to/from T2CCL will access channel X as currently selected by T2CCA.The data registers for the remaining

unselected channels are not accessible.

Table 13-1.

T2CCA – Timer/Counter 2 Compare/Capture Address

T2CCA Address = 0D1H

Reset Value = xxxx xx00B

Not Bit Addressable

–

T2CCA.1

T2CCA.0

Bit

654

321

Symbol

Function

T2CCA

[1 - 0]

Compare/Capture Address. Selects which CCA channel is currently accessible through the T2CCH, T2CCL and T2CCC

registers. Only one channel may be accessed at a time.

T2CCA1

T2CCA0

Channel

A – T2CCH, T2CCL and T2CCC access data and control for Channel A

B – T2CCH, T2CCL and T2CCC access data and control for Channel B

C – T2CCH, T2CCL and T2CCC access data and control for Channel C

D – T2CCH, T2CCL and T2CCC access data and control for Channel D

Table 13-2.

T2CCH – Timer/Counter 2 Compare/Capture Data High

T2CCH Address = 0D2H

Reset Value = 0000 0000B

Not Bit Addressable

T2CCD.15

T2CCD.14

T2CCD.13

T2CCD.12

T2CCD.11

T2CCD.10

T2CCD.9

T2CCD.8

Bit

654

321

Symbol

Function

T2CCD

[15 - 8]

Compare/Capture Data (High Byte). Reads from T2CCH will return the high byte from the CCA channel currently

selected by T2CCA. The high byte of the selected CCA channel will be updated with the contents of T2CCH when

T2CCL is written. When writing multiple channels with the same high byte, T2CCH need not be updated between writes

to T2CCL.

Table 13-3.

T2CCL – Timer/Counter 2 Compare/Capture Data Low

T2CCC Address = 0D3H

Reset Value = 0000 0000B

Not Bit Addressable

T2CCD.7

T2CCD.6

T2CCD.5

T2CCD.4

T2CCD.3

T2CCD.2

T2CCD.1

T2CCD.0

Bit

654

321

Symbol

Function

T2CCD

[7 - 0]

Compare/Capture Data (Low Byte). Reads from T2CCL will return the low byte from the CCA channel currently selected

by T2CCA. Writes to T2CCL will update the selected CCA channel with the 16-bit contents of T2CCH and T2CCL.

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