P89C668 Philips Semiconductors, P89C668 Datasheet - Page 13

• Manufacturer Part Number: P89C668
• Description: 80C51 8-bit Flash microcontroller family 64KB ISP FLASH with 8KB RAM
• Manufacturer: Philips Semiconductors

Philips Semiconductors
2001 Jul 27
80C51 8-bit Flash microcontroller family
64KB ISP Flash with 8KB RAM
T2EX PIN
OSC
T2 PIN
OSC
T2 PIN
6
TRANSITION
DETECTOR
6
C/T2 = 0
C/T2 = 1
C/T2 = 0
C/T2 = 1
EXEN2
TR2
Figure 4. Timer 2 in Auto-Reload Mode (DCEN = 0)
CONTROL
Figure 5. Timer 2 Auto Reload Mode (DCEN = 1)
CONTROL
TR2
(DOWN COUNTING RELOAD VALUE)
CONTROL
(UP COUNTING RELOAD VALUE)
RELOAD
RCAP2L
FFH
TL2
13
(8-BITS)
RCAP2L
RCAP2H
TL2
FFH
TH2
(8-BITS)
OVERFLOW
RCAP2H
TH2
T2EX PIN
EXF2
TF2
COUNT
DIRECTION
1 = UP
0 = DOWN
TOGGLE
TF2
P89C668
EXF2
Preliminary data
INTERRUPT
INTERRUPT
SU01212
TIMER 2
SU01211