AT89LP51RB2 datasheet(98/254 Pages) ATMEL

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3722A–MICRO–10/11

AT89LP51RB2/RC2/IC2 Preliminary

Figure 15-2. PCA Interrupt System

15.2

PCA Modules

Each one of the five compare/capture modules has six possible functions. It can perform:

• 16-bit Capture, positive-edge triggered

• 16-bit Capture, negative-edge triggered

• 16-bit Capture, both positive and negative-edge triggered

• 16-bit Software Timer

• 16-bit High Speed Output

• 8-bit Pulse Width Modulator

In addition, Module 4 can be used as a Watchdog Timer.

Each module in the PCA has a special function register associated with it. These registers are:

CCAPM0 for Module 0, CCAPM1 for Module 1, etc. (See Table 15-6). The registers contain the

bits that control the mode that each module will operate in.

• The ECCF bit (CCAPMn.0 where n = 0, 1, 2, 3, or 4 depending on the module) enables the

CCF flag in the CCON SFR to generate an interrupt when a match or compare occurs in the

associated module.

• PWM (CCAPMn.1) enables the pulse width modulation mode.

Table 15-5.

CL – PCA Counter Register Low

CL Address = 0E9H

Reset Value = 0000 0000B

Not Bit Addressable

Bit

654

321

Symbol

Function

7-0

Module n Compare/Capture Register Low

Holds the lower order bits of the 16-bit PCA Timer/Counter.

CCF0

ECF

ECCF0

ECCF1

ECCF2

ECCF3

ECCF4

CCF0

CCON

Timer/Counter

Module 4

Module 3

Module 2

Module 1

Module 0

IEN0.6

IEN0.7

PCA Interrupt

to priority

decoder

CMOD.0

CCAPMn.0

AT89LP51RB2 Datasheet(PDF) 98 Page - ATMEL Corporation

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