89C51 データシートの表示（PDF） - Philips Electronics

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89C51

80C51 8-bit microcontroller family 4K/8K/16K/32K Flash

Philips Electronics 

Philips Semiconductors

80C51 8-bit microcontroller family

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

Table 3. Timer 2 Operating Modes

RCLK + TCLK

CP/RL2

TR2

0

0

1

0

1

1

1

X

1

X

X

0

Product specification

89C51/89C52/89C54/89C58

16-bit Auto-reload

16-bit Capture

Baud rate generator

(off)

MODE

OSC

÷ 12

T2 Pin

C/T2 = 0

C/T2 = 1

TL2

(8-bits)

TH2

(8-bits)

TF2

Control

Transition

Detector

TR2 Capture

RCAP2L

RCAP2H

Timer 2

Interrupt

T2EX Pin

Control

EXEN2

Figure 2. Timer 2 in Capture Mode

EXF2

SU00066

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

1999 Oct 27

10

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