Philips Semiconductors
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
Product specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
(8XC51FX and 8XC51RX+ ONLY)
WRITE TO
CCAPnH RESET
WRITE TO
CCAPnL
0
1
ENABLE
CF
CR
––
CCF4
CCF3
CCF2
CCF1
CCF0
CCON
(D8H)
CCAPnH
CCAPnL
(TO CCFn)
PCA INTERRUPT
16–BIT COMPARATOR
MATCH
CH
CL
PCA TIMER/COUNTER
TOGGLE
CEXn
––
ECOMn CAPPn CAPNn MATn
TOGn
PWMn
ECCFn
CCAPMn, n: 0..4
(DAH – DEH)
0
0
1
0
Figure 23. PCA High Speed Output Mode
SU00751
CCAPnH
ENABLE
OVERFLOW
CCAPnL
8–BIT
COMPARATOR
0
CL < CCAPnL
CL >= CCAPnL
1
CL
PCA TIMER/COUNTER
CEXn
––
ECOMn CAPPn CAPNn MATn
TOGn
PWMn ECCFn
0
0
0
0
0
Figure 24. PCA PWM Mode
CCAPMn, n: 0..4
(DAH – DEH)
SU00752
1999 Apr 01
30