AT89C51ED2-RDTUM datasheet(41/137 Pages) ATMEL

41 / 137 page

4235K–8051–05/08

AT89C51RD2/ED2

Table 13-4.

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 13-5 & Table 13-6).

Table 13-5.

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)

Reset Value = 0000 0000b

Not bit addressable

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

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