P89C51RC2BASLASH01 datasheet(17/68 Pages) PHILIPS

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Philips Semiconductors

Preliminary data

P89C51RA2/RB2/RC2/RD2xx

80C51 8-bit Flash microcontroller family

8KB/16KB/32KB/64KB ISP/IAP Flash with 512B/512B/512B/1KB RAM

2002 Jul 18

Table 3.

Timer 2 Operating Modes

RCLK + TCLK

CP/RL2

TR2

MODE

16-bit Auto-reload

16-bit Capture

Baud rate generator

(off)

OSC

÷ n*

C/T2 = 0

C/T2 = 1

TR2

Control

TL2

(8 BITS)

TH2

(8 BITS)

TF2

RCAP2L

RCAP2H

EXEN2

Control

EXF2

Timer 2

Interrupt

T2EX Pin

Transition

Detector

T2 Pin

Capture

SU01252

* n = 6 in 6-clock mode, or 12 in 12-clock mode.

Figure 7. Timer 2 in Capture Mode

Not Bit Addressable

Symbol

Function

—

Not implemented, reserved for future use.*

T2OE

Timer 2 Output Enable bit.

DCEN

Down Count Enable bit. When set, this allows Timer 2 to be configured as an up/down counter.

—

T2OE

DCEN

SU00729

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.

Bit

T2MOD

Address = 0C9H

Reset Value = XXXX XX00B

Figure 8. Timer 2 Mode (T2MOD) Control Register

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