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P80C54UFBB

80C51 8-bit microcontroller family 8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V), low power, high speed (33 MHz)

NXP Semiconductors. 

Philips Semiconductors

80C51 8-bit microcontroller family

8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),

low power, high speed (33MHz)

Product specification

8XC54/58

8XC51FA/FB/FC/80C51FA

8XC51RA+/RB+/RC+/RD+/80C51RA+

Table 4. Timer 2 Operating Modes

RCLK + TCLK

CP/RL2

0

0

0

1

1

X

X

X

TR2

MODE

1

16-bit Auto-reload

1

16-bit Capture

1

Baud rate generator

0

(off)

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

2000 Aug 07

15

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