Philips Semiconductors

Product specification

80C575/83C575/

87C575

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

1998 May 01

13

CCAPMn Address

CCAPM0

0DAH

CCAPM1

0DBH

CCAPM2

0DCH

CCAPM3

0DDH

CCAPM4

0DEH

Reset Value = X000 0000B

–

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMn

ECCFn

Not Bit Addressable

Bit:

Symbol

Function

–

Not implemented, reserved for future use*.

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.

MATn

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.

TOGn

Toggle. When TOGn = 1, a match of the PCA counter with this module’s compare/capture register causes the CEXn

pin to toggle.

PWMn

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.

NOTE:

*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.

SU00037

7654

321

0

Figure 7. CCAPMn: PCA Modules Compare/Capture Registers

–

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMn

ECCFn

MODULE FUNCTION

X

0

0

0

0

0

0

0

No operation

X

X

1

0

0

0

0

X

16-bit capture by a positive-edge trigger on CEXn

X

X

0

1

0

0

0

X

16-bit capture by a negative trigger on CEXn

X

X

1

1

0

0

0

X

16-bit capture by a transition on CEXn

X

1

0

0

1

0

0

X

16-bit Software Timer

X

1

0

0

1

1

0

X

16-bit High Speed Output

X

1

0

0

0

0

1

0

8-bit PWM

X

1

0

0

1

X

0

X

Watchdog Timer

Figure 8. PCA Module Modes (CCAPMn Register)