P87C52 PHILIPS [NXP Semiconductors], P87C52 Datasheet - Page 19

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

Philips Semiconductors
2003 Jan 24
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)
*
*n = 6 in 6-clock mode; n = 12 in 12-clock mode.
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.
OSC
T2 Pin
Not Bit Addressable
Address = 0C9H
Position
T2MOD.1
T2MOD.0
Transition
Detector
n*
—
7
EXEN2
—
6
C/T2 = 0
C/T2 = 1
Figure 8. Timer 2 Mode (T2MOD) Control Register
Control
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.
Figure 7. Timer 2 in Capture Mode
—
5
TR2
Control
—
Capture
4
19
—
3
RCAP2L
(8 bits)
TL2
—
2
(8 bits)
RCAP2H
TH2
T2OE
1
P80C3xX2; P80C5xX2;
EXF2
TF2
Reset Value = XXXX XX00B
DCEN
0
P87C5xX2
Product data
SU01622
Interrupt
SU01519
Timer 2