P89V51RB2BBC datasheet(53/80 Pages) NXP

53 / 80 page

P89V51RB2_RC2_RD2_5

Product data sheet

Rev. 05 — 12 November 2009

53 of 80

NXP Semiconductors

P89V51RB2/RC2/RD2

8-bit microcontrollers with 80C51 core

6.9.4 PWM mode

All of the PCA modules can be used as PWM outputs (Figure 26). Output frequency

depends on the source for the PCA timer.

All of the modules will have the same frequency of output because they all share one and

only PCA timer. The duty cycle of each module is independently variable using the

module’s capture register CCAPnL. When the value of the PCA CL SFR is less than the

Fig 25. PCA high-speed output mode

002aaa540

toggle

CEXn

CCF4

CCF3

CCF2

CCF1

CCF0

CCON

(D8H)

PCA

interrupt

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMn

ECCFn

CCAPMn, n = 0 to 4

(DAH to DEH)

16-BIT COMPARATOR

PCA timer/counter

match

(to CCFn)

CCAPnH

CCAPnL

enable

write to

CCAPnH

write to

CCAPnL

reset

Fig 26. PCA PWM mode

002aaa541

ECOMn

001

CAPPn

CAPNn

MATn

TOGn

PWMn

ECCFn

CCAPMn, n = 0 to 4

(DAH to DEH)

CCAPnL

8-BIT COMPARATOR

PCA timer/counter

CCAPnH

enable

CEXn

< CCAPnL

≥ CCAPnL

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