P89V51RB2/RC2/RD2 8-bit 80C51 5 V low power 16/32 ... - NetMedia
P89V51RB2/RC2/RD2 8-bit 80C51 5 V low power 16/32 ... - NetMedia
P89V51RB2/RC2/RD2 8-bit 80C51 5 V low power 16/32 ... - NetMedia
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NXP Semiconductors<br />
<strong>P89V51RB2</strong>/<strong>RC2</strong>/<strong>RD2</strong><br />
8-<strong>bit</strong> microcontrollers with <strong>80C51</strong> core<br />
CF CR - CCF4 CCF3 CCF2 CCF1 CCF0<br />
CCON<br />
(D8H)<br />
write to<br />
CCAPnL<br />
write to<br />
CCAPnH<br />
0 1<br />
reset<br />
enable<br />
CCAPnH<br />
CCAPnL<br />
<strong>16</strong>-BIT COMPARATOR<br />
match<br />
(to CCFn)<br />
PCA<br />
interrupt<br />
CH<br />
CL<br />
PCA timer/counter<br />
toggle<br />
CEXn<br />
- ECOMn<br />
CAPPn CAPNn MATn TOGn PWMn ECCFn<br />
0 0 1 0 0<br />
CCAPMn, n = 0 to 4<br />
(DAH to DEH)<br />
002aaa540<br />
Fig 25. PCA high-speed output mode<br />
6.9.4 PWM mode<br />
All of the PCA modules can be used as PWM outputs (Figure 26). Output frequency<br />
depends on the source for the PCA timer.<br />
CCAPnH<br />
CCAPnL<br />
0<br />
enable<br />
8-BIT COMPARATOR<br />
CL < CCAPnL<br />
CEXn<br />
CL ≥ CCAPnL<br />
CL<br />
PCA timer/counter<br />
1<br />
- ECOMn<br />
CAPPn CAPNn MATn TOGn PWMn ECCFn<br />
CCAPMn, n = 0 to 4<br />
(DAH to DEH)<br />
1 0 0 0 0 1 1<br />
002aaa541<br />
Fig 26. PCA PWM mode<br />
<strong>P89V51RB2</strong>_<strong>RC2</strong>_<strong>RD2</strong>_4<br />
All of the modules will have the same frequency of output because they all share one and<br />
only PCA timer. The duty cycle of each module is independently variable using the<br />
module’s capture register CCAPnL. When the value of the PCA CL SFR is less than the<br />
© NXP B.V. 2007. All rights reserved.<br />
Product data sheet Rev. 04 — 1 May 2007 53 of 80
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