P87C52 PHILIPS [NXP Semiconductors], P87C52 Datasheet - Page 12

• Manufacturer Part Number: P87C52
• Description: 80C51 8-bit microcontrollers 16K/32K, 512 OTP, I2C, watchdog timer
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
2000 Aug 07
80C51 8-bit microcontroller family
4 K/8 K OTP/ROM low voltage (2.7 V–5.5 V),
low power, high speed (33 MHz), 128/256 B RAM
*
T2EX PIN
Symbol
—
T2OE
DCEN
T2MOD
User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features.
In that case, the reset or inactive value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is
indeterminate.
T2 PIN
OSC
Not Bit Addressable
Address = 0C9H
Function
Not implemented, reserved for future use.*
Timer 2 Output Enable bit.
Down Count Enable bit. When set, this allows Timer 2 to be configured as an up/down counter.
TRANSITION
Bit
DETECTOR
12
—
7
C/T2 = 0
C/T2 = 1
—
EXEN2
6
Figure 4. Timer 2 in Auto-Reload Mode (DCEN = 0)
Figure 3. Timer 2 Mode (T2MOD) Control Register
CONTROL
—
5
TR2
CONTROL
RELOAD
—
4
12
(8-BITS)
RCAP2L
TL2
—
3
(8-BITS)
RCAP2H
TH2
—
2
80C51/87C51/80C52/87C52
T2OE
1
EXF2
TF2
Reset Value = XXXX XX00B
DCEN
0
Product specification
INTERRUPT
SU00729
TIMER 2
SU00067