AT87C5111-ICSIL datasheet(48/86 Pages) ATMEL

48 / 86 page

AT8xC5111

4190A–8051–11/02

•

The last bit in the register ECOM (CCAPMn.6) when set enables the comparator

function.

Table 35 shows the CCAPMn settings for the various PCA functions.

Table 3. CCAPMn: PCA Modules Compare/Capture Control Registers

CAPMn Address n = 0 - 4

7654

3210

ECOMn

CAPPn

CAPn

MATn

TOGn

PWMm

ECCFn

Bit

Number

Bit

Mnemonic

Description

Not implemented, reserved for future use.

(1)

User software should not write 1s to reserved bits. These bits may be used in future 8051

family products to invoke new features. In that case, the reset or inactive value of the

new bit will be 0, and its active value will be 1. The value read from a reserved bit is

indeterminate.

ECOMn

Enable Comparator. ECOMn = 1 enables the comparator function.

CAPPn

Capture Positive, CAPPn = 1 enables positive edge capture.

CAPNn

Capture Negative, CAPNn = 1 enables negative edge capture.

3MATn

Match. When MATn = 1, a match of the PCA counter with this module’s

compare/capture register causes the CCFn bit in CCON to be set, flagging an

interrupt.

2TOGn

Toggle. When TOGn = 1, a match of the PCA counter with this module’s

compare/capture register causes the CEXn pin to toggle.

1PWMn

Pulse Width Modulation Mode. PWMn = 1 enables the CEXn pin to be used as a

pulse width modulated output.

ECCFn

Enable CCF interrupt. Enables compare/capture flag CCFn in the CCON register

to generate an interrupt.

Reset value = X000000

Table 4. PCA Module Modes (CCAPMn Registers)

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMm

ECCFn

Module Function

000

No Operation

000

16-bit capture by a positive-edge

trigger on CEXn

100

16-bit capture by a negative trigger

on CEXn

100

16-bit capture by a transition on

CEXn

010

16-bit Software Timer/Compare

mode.

16-bit High-speed Output

000

8-bit PWM

Watchdog Timer (module 4 only)

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