P89CV51RB2FBC datasheet(45/73 Pages) NXP

45 / 73 page

P89CV51RB2_RC2_RD2_1

Product data sheet

Rev. 01 — 5 October 2007

45 of 73

NXP Semiconductors

P89CV51RB2/RC2/RD2

80C51 with 1 kB RAM, SPI

6.9.1 PCA capture mode

To use one of the PCA modules in the Capture mode (Figure 21), either one or both of the

CCAPM bits CAPN and CAPP for that module must be set. The external CEX input for the

module (on port 1) is sampled for a transition. When a valid transition occurs, the PCA

hardware loads the value of the PCA counter registers (CH and CL) into the module’s

capture registers (CCAPnL and CCAPnH).

Table 37.

CCAPMn - PCA modules compare/capture register (address CCAPM0 DAH,

CCAPM1 DBH, CCAPM2 DCH, CCAPM3 DDH, CCAPM4 DEH) bit allocation

Not bit addressable; reset value: 00H.

Bit

Symbol

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMn

ECCFn

Table 38.

CCAPMn - PCA modules compare/capture register (address CCAPM0 DAH,

CCAPM1 DBH, CCAPM2 DCH, CCAPM3 DDH, CCAPM4 DEH) bit description

Bit

Symbol

Description

Reserved for future use. Should be set to 0 by user programs.

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.

Table 39.

PCA module modes (CCAPMn register)

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMn

ECCFn

Module function

no operation

16-bit capture by a positive-edge trigger on

CEXn

16-bit capture by a negative-edge trigger on

CEXn

16-bit capture by any transition on CEXn

16-bit software timer

16-bit high-speed output

8-bit PWM

watchdog timer

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