AT89C5131A-RDTUM datasheet(63/188 Pages) ATMEL

63 / 188 page

4337K–USB–04/08

AT89C5130A/31A-M

Reset Value = X000 0000b

Not bit addressable

Table 14-4.

PCA Module Modes (CCAPMn Registers)

There are two additional registers associated with each of the PCA modules. They are CCAPnH

and CCAPnL and these are the registers that store the 16-bit count when a capture occurs or a

compare should occur. When a module is used in the PWM mode these registers are used to

control the duty cycle of the output (see Table 14-5 and Table 14-6)

Table 14-5.

CCAPnH Registers (n = 0-4)

CCAP0H - PCA Module 0 Compare/Capture Control Register High (0FAh)

CCAP1H - PCA Module 1 Compare/Capture Control Register High (0FBh)

CCAP2H - PCA Module 2 Compare/Capture Control Register High (0FCh)

CCAP3H - PCA Module 3 Compare/Capture Control Register High (0FDh)

CCAP4H - PCA Module 4 Compare/Capture Control Register High (0FEh)

PWMn

Pulse Width Modulation Mode

Cleared to disable the CEXn pin to be used as a pulse width modulated output.

Set to enable the CEXn pin to be used as a pulse width modulated output.

ECCFn

Enable CCF Interrupt

Cleared to disable compare/capture flag CCFn in the CCON register to generate an

interrupt.

Set to enable compare/capture flag CCFn in the CCON register to generate an

interrupt.

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMm ECCFn Module Function

No Operation

16-bit capture by a positive-edge

trigger on CEXn

16-bit capture by a negative trigger

on CEXn

16-bit capture by a transition on

CEXn

16-bit Software Timer/Compare

mode.

16-bit High Speed Output

8-bit PWM

Watchdog Timer (module 4 only)

Bit

Number

Bit

Mnemonic

Description

7 - 0

PCA Module n Compare/Capture Control

CCAPnH Value

Bit

Number

Bit

Mnemonic

Description

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