P80C31 View Datasheet(PDF) - Philips Electronics
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Description
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P80C31 Datasheet PDF : 38 Pages
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Philips Semiconductors
80C51 8-bit microcontroller family
4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33 MHz)
Product specification
80C51/87C51/80C31
OSC
÷12
C/T2 = 0
T2 PIN
C/T2 = 1
(DOWN COUNTING RELOAD VALUE)
FFH
FFH
TOGGLE
EXF2
OVERFLOW
TL2
TH2
TF2
CONTROL
TR2
RCAP2L
RCAP2H
(UP COUNTING RELOAD VALUE)
Figure 5. Timer 2 Auto Reload Mode (DCEN = 1)
COUNT
DIRECTION
1 = UP
0 = DOWN
T2EX PIN
Timer 1
Overflow
INTERRUPT
SU00730
OSC
NOTE: OSC. Freq. is divided by 2, not 12.
÷2
C/T2 = 0
T2 Pin
C/T2 = 1
Transition
Detector
Control
TR2
TL2
(8-bits)
TH2
(8-bits)
Reload
RCAP2L
RCAP2H
÷2
“0”
“1”
“1”
“0”
SMOD
RCLK
“1”
“0”
÷ 16
RX Clock
TCLK
÷ 16
TX Clock
T2EX Pin
EXF2
Timer 2
Interrupt
Control
EXEN2
Note availability of additional external interrupt.
Figure 6. Timer 2 in Baud Rate Generator Mode
SU00068
2000 Jan 20
12
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