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P89V51RB2BBC датащи(PDF) 53 Page - NXP Semiconductors

номер детали P89V51RB2BBC
подробное описание детали  8-bit 80C51 5 V low power 16/32/64 kB flash microcontroller with 1 kB RAM
PDF  80 Pages
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производитель  NXP [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo NXP - NXP Semiconductors

P89V51RB2BBC датащи(HTML) 53 Page - NXP Semiconductors

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P89V51RB2_RC2_RD2_5
© NXP B.V. 2009. All rights reserved.
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
CF
CR
-
CCF4
CCF3
CCF2
CCF1
CCF0
CCON
(D8H)
PCA
interrupt
-
ECOMn
00
1
0
0
CAPPn
CAPNn
MATn
TOGn
PWMn
ECCFn
CCAPMn, n = 0 to 4
(DAH to DEH)
16-BIT COMPARATOR
PCA timer/counter
CH
CL
match
(to CCFn)
CCAPnH
CCAPnL
enable
write to
CCAPnH
write to
CCAPnL
reset
01
Fig 26. PCA PWM mode
002aaa541
-
ECOMn
0
1
0
001
1
CAPPn
CAPNn
MATn
TOGn
PWMn
ECCFn
CCAPMn, n = 0 to 4
(DAH to DEH)
CCAPnL
8-BIT COMPARATOR
PCA timer/counter
CCAPnH
CL
enable
CEXn
CL
< CCAPnL
CL
≥ CCAPnL
0
1



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