AT89C51ID2-RDTIM datasheet(47/159 Pages) ATMEL

47 / 159 page

AT89C51ID2

4289A–8051–09/03

Table 29. 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 30 &

Table 31).

Table 30. 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)

Reset Value = 0000 0000b

Not bit addressable

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMm

ECCFn

Module Function

00000

No Operation

1000

16-bit capture by a positive-edge

trigger on CEXn

0100

16-bit capture by a negative trigger

on CEXn

1100

16-bit capture by a transition on

CEXn

10010

16-bit Software Timer / Compare

mode.

10011

16-bit High Speed Output

10000

8-bit PWM

1001

Watchdog Timer (module 4 only)

7654

3210

----

Bit

Number

Bit

Mnemonic

Description

7-0

PCA Module n Compare/Capture Control

CCAPnH Value

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