
Philips Semiconductors
Product data
P80C3xX2; P80C5xX2;
P87C5xX2
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V),
low power, high speed (30/33 MHz)
2003 Jan 24
20
TR2
CONTROL
TL2
(8-BITS)
TH2
(8-BITS)
TF2
RCAP2L
RCAP2H
EXEN2
CONTROL
EXF2
TIMER 2
INTERRUPT
T2EX PIN
TRANSITION
DETECTOR
RELOAD
SU01623
C/T2 = 0
C/T2 = 1
*n = 6 in 6-clock mode; n = 12 in 12-clock mode.
OSC
÷
n*
T2 Pin
Figure 9. Timer 2 in Auto-Reload Mode (DCEN = 0)
TL2
TH2
TR2
CONTROL
SU01624
FFH
FFH
RCAP2L
RCAP2H
(UP COUNTING RELOAD VALUE)
T2EX PIN
TF2
INTERRUPT
COUNT
DIRECTION
1 = UP
0 = DOWN
EXF2
OVERFLOW
(DOWN COUNTING RELOAD VALUE)
TOGGLE
C/T2 = 0
C/T2 = 1
*n = 6 in 6-clock mode; n = 12 in 12-clock mode.
OSC
÷
n*
T2 Pin
Figure 10. Timer 2 Auto Reload Mode (DCEN = 1)