AT89C55WD-33AU データシートの表示（PDF） - Atmel Corporation

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AT89C55WD-33AU

8-bit Microcontroller with 20K Bytes Flash

Atmel Corporation 

AT89C55WD

Table 12-2. T2MOD – Timer 2 Mode Control Register

T2MOD Address = 0C9H

Not Bit Addressable

–

–

–

–

–

Bit

7

6

5

4

3

Reset Value = XXXX XX00B

–

T2OE

DCEN

2

1

0

Symbol

–

T2OE

DCEN

Function

Not implemented, reserved for future

Timer 2 Output Enable bit

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

Figure 12-3. Timer 2 Auto Reload Mode (DCEN = 1)

(DOWN COUNTING RELOAD VALUE)

0FFH

0FFH

TOGGLE

EXF2

OSC

÷ 12

T2 PIN

C/T2 = 0

C/T2 = 1

OVERFLOW

TH2

TL2

CONTROL

TR2

TF2

TIMER 2

INTERRUPT

RCAP2H RCAP2L

(UP COUNTING RELOAD VALUE)

COUNT

DIRECTION

1=UP

0=DO

T2EX PIN

13

1921D–MICRO–6/08

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