Q67120-C1056 データシートの表示（PDF） - Siemens AG

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Q67120-C1056

8-Bit CMOS Microcontroller

Siemens AG 

C501

Timer 2

Timer 2 is a 16-bit timer/counter with an up/down count feature. It can operate either as timer or as

an event counter which is selected by bit C/T2 (T2CON.1). It has three operating modes as shown

in table 5.

Table 5

Timer/Counter 2 Operating Modes

Mode

16-bit

Auto-

reload

16-bit

Cap-

ture

Baud

Rate

Gene-

rator

off

T2CON

R×CLK

or

T×CLK

CP/

RL2

0

0

0

0

0

0

0

0

0

1

0

1

1

X

1

X

X

X

T2MOD T2CON

TR2

DCEN

P1.1/

T2EX

Remarks

EXEN

Input Clock

internal

external

(P1.0/T2)

1

0

1

0

1

1

1

1

1

X

1

X

1

X

1

X

0

X

0

X reload upon

overflow

1

↓ reload trigger

(falling edge)

fOSC/12

max

fOSC/24

X

0 Down counting

X

1 Up counting

0

X 16 bit Timer/

Counter (only

1

up-counting)

↓ capture TH2,

fOSC/12

max

fOSC/24

TL2 → RC2H,

RC2L

0

X no overflow

interrupt

1

request (TF2)

↓ extra external

fOSC/2

max

fOSC/24

interrupt

(“Timer 2”)

X

X Timer 2 stops

–

–

Note: ↓ =

falling edge

Semiconductor Group

20

1997-04-01

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