Philips Semiconductors

Preliminary data

P89C51X2/52X2/54X2/58X2

80C51 8-bit Flash microcontroller family

4K/8K/16K/32K Flash

2002 Jun 06

17

TR2

Control

TL2

(8 bits)

TH2

(8 bits)

TF2

RCAP2L

RCAP2H

EXEN2

Control

EXF2

Timer 2

Interrupt

T2EX Pin

Transition

Detector

Capture

SU01622

C/T2 = 0

C/T2 = 1

*n = 6 in 6-clock mode; n = 12 in 12-clock mode.

OSC

÷ n*

T2 Pin

Figure 7. Timer 2 in Capture Mode

Not Bit Addressable

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.

—

—

—

—

—

—

T2OE

DCEN

SU01519

76

54

32

1

0

*

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.

T2MOD

Address = 0C9H

Reset Value = XXXX XX00B

Figure 8. Timer 2 Mode (T2MOD) Control Register