P80C31 View Datasheet(PDF) - Philips Electronics

Part Name

Description

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P80C31

80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage (2.7V–5.5V), low power, high speed (33 MHz)

Philips Electronics 

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

T2MOD Address = 0C9H

Reset Value = XXXX XX00B

Not Bit Addressable

—

—

—

—

—

—

T2OE DCEN

Bit

7

6

5

4

3

2

1

0

Symbol Function

—

T2OE

DCEN

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.

* 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.

SU00729

Figure 3. Timer 2 Mode (T2MOD) Control Register

OSC

÷ 12

T2 PIN

C/T2 = 0

C/T2 = 1

TRANSITION

DETECTOR

CONTROL

TR2 RELOAD

TL2

(8-BITS)

TH2

(8-BITS)

RCAP2L

RCAP2H

TF2

T2EX PIN

CONTROL

EXEN2

Figure 4. Timer 2 in Auto-Reload Mode (DCEN = 0)

EXF2

TIMER 2

INTERRUPT

SU00067

2000 Jan 20

11

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