ATAM862 datasheet(49/110 Pages) ATMEL

49 / 110 page

4554E–4BMCU–05/06

ATAM862-3

22.9.2

Mode 2: 8-bit Compare Counter with 4-bit Programmable Prescaler

Figure 22-11. 8-bit Compare Counter

The 4-bit stage is used as programmable prescaler for the 8-bit counter stage. In this mode, a

duty cycle stage is also available. This stage can be used as an additional 2-bit prescaler or for

generating duty cycles of 25%, 33% and 50%. The 4-bit compare output (CM1) supplies the

clock output (POUT) with clocks.

22.9.3

Mode 3/4: 8-bit Compare Counter and 4-bit Programmable Prescaler

Figure 22-12. 4-/8-bit Compare Counter

In these modes the 4-bit and the 8-bit counter stages work independently as a 4-bit prescaler

and an 8-bit timer with an 2-bit prescaler or as a duty cycle generator. Only in the mode 3 and

mode 4, can the 8-bit counter be supplied via the external clock input (T2I) which is selected via

the P4CR register. The 4-bit prescaler is started via activating of mode 3 and stopped and reset

in mode 4. Changing mode 3 and 4 has no effect for the 8-bit timer stage. The 4-bit stage can be

used as prescaler for Timer 3, the SSI or to generate the stop signal for modulator 2 and

modulator 3.

4-bit counter

4-bit compare

RES

4-bit register

CM1

POUT

8-bit counter

8-bit compare

8-bit register

OVF2

CM2

RES

T2RM

T2OTM

Timer 2

output mode

and T2OTM-bit

T2IM

T2CTM

TOG2

INT4

CL2/1

DCG

T2D1, 0

DCGO

4-bit counter

4-bit compare

RES

4-bit register

8-bit counter

8-bit compare

8-bit register

OVF2

CM2

RES

T2RM

T2OTM

Timer 2

output mode

and T2OTM-bit

T2IM

T2CTM

TOG2

INT4

CL2/2

DCG

T2D1, 0

DCGO

P41M2, 1

P4CR

CM1

POUT

CL2/1

MUX

TOG3

T1OUT

SYSCL

SCL

T2CS1, 0

SYSCL

T2I

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