ATAM894 datasheet(31/97 Pages) ATMEL

31 / 97 page

4679D–4BMCU–05/05

ATAM894

6.3

Universal Timer/Counter/ Communication Module (UTCM)

The Universal Timer/counter/Communication Module (UTCM) consists of three timers

(Timer 1,Timer 2, Timer 3) and a Synchronous Serial Interface (SSI).

• Timer 1 is an interval timer that can be used to generate periodic interrupts and as prescaler

for Timer 2, Timer 3, the serial interface and the watchdog function.

• Timer 2 is an 8/12-bit timer with an external clock input (T2I) and an output (T2O).

• Timer 3 is an 8-bit timer/counter with its own input (T3I) and output (T3O).

• The SSI operates as a two-wire serial interface or as shift register for modulation and

demodulation. The modulator and demodulator units work together with the timers and shift

the data bits into or out of the shift register.

There is a multitude of modes in which the timers and the serial interface can work together.

Figure 6-7.

UTCM Block Diagram

Demodu-

lator 3

8-bit Counter 3

Capture 3

Compare 3/1

Compare 3/2

Modu-

lator 3

MUX

Control

Watchdog

Interval/Prescaler

Timer 1

Timer 3

Modu-

lator 2

4-bit Counter 2/1

Compare 2/1

MUX

DCG

8-bit Counter 2/2

Compare 2/2

Control

Timer 2

MUX

8-bit shift register

Receive buffer

Transmit buffer

Control

SSI

SCL

INT4

INT5

INT2

NRST

INT3

POUT

TOG2

TOG3

T1OUT

SUBCL

SYSCL

from clock module

T3O

T3I

T2I

T2O

I/O bus

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