P-87C52 View Datasheet(PDF) - Philips Electronics

Part Name

Description

View to exact match

P-87C52

80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V/ low power/ high speed 30/33 MHz

Philips Electronics 

Philips Semiconductors

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)

Preliminary data

80C3xX2; 80C5xX2;

87C5xX2

OSC

÷ 12

÷6

T2 Pin

X2 = 0

X2 = 1

C/T2 = 0

C/T2 = 1

Control

TL2

(8-bits)

TH2

(8-bits)

TF2

Transition

Detector

TR2 Capture

RCAP2L

RCAP2H

T2EX Pin

Control

EXEN2

EXF2

Figure 7. Timer 2 in Capture Mode

Timer 2

Interrupt

SU01496

T2MOD Address = 0C9H

Reset Value = XXXX XX00B

Not Bit Addressable

7

6

5

4

3

2

1

0

—

—

—

—

—

—

T2OE DCEN

Symbol Position

Function

—

Not implemented, reserved for future use.*

T2OE

T2MOD.1

Timer 2 Output Enable bit.

DCEN

T2MOD.0

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.

Figure 8. Timer 2 Mode (T2MOD) Control Register

SU01519

2001 Sep 24

17

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