AT89C51ED2-RDTIM datasheet(42/137 Pages) ATMEL

42 / 137 page

AT89C51RD2/ED2

4235E–8051–04/04

Table 25. 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 26 &

Table 27).

Table 26. 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

0000000

No Operation

10000

16-bit capture by a positive-edge

trigger on CEXn

01000

16-bit capture by a negative trigger

on CEXn

11000

16-bit capture by a transition on

CEXn

100100

16-bit Software Timer/Compare

mode.

100110

16-bit High Speed Output

1000010

8-bit PWM

1001

Watchdog Timer (module 4 only)

Bit

Number

Bit

Mnemonic

Description

7 - 0

PCA Module n Compare/Capture Control

CCAPnH Value

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