t6020m ATMEL Corporation, t6020m Datasheet - Page 30

• Manufacturer Part Number: t6020m
• Description: Low-current Microcontroller For Watchdog Function
• Manufacturer: ATMEL Corporation

Mode 2: 8-bit compare counter with 4-bit programmable prescaler
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.
Mode 3/4: 8-bit compare counter and 4-bit programmable prescaler
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 the SSI or to
generate the stop signal for modulator 2.
T6020M
CL2/1
30 (54)
T2I
T1OUT
SYSCL
SYSCL
SCL
4-bit compare
4-bit counter
4-bit register
P4CR
T2CS1, 0
P41M2, 1
MUX
CL2/2
RES
CL2/1
CM1
T2D1, 0
DCG
T2D1, 0
DCG
POUT
8-bit compare
4-bit compare
8-bit counter
8-bit register
4-bit counter
4-bit register
8-bit compare
8-bit counter
8-bit register
Figure 29. 4-/8-bit compare counter
Figure 28. 8-bit compare counter
RES
RES
OVF2
CM2
CM1
RES
T2RM
OVF2
CM2
T2RM
T2OTM
Timer 2 Output Modes
The signal at the timer output is generated via
modulator 2. In the toggle mode, the compare match
event toggles the output T2O. For high resolution duty
cycle modulation 8 bits or 12 bits can be used to toggle the
output. In the duty cycle burst modulator modes the DCG
output is connected to T2O and switched on and off either
by the toggle flipflop output or the serial data line of the
T2OTM
and T2OTM–bit
output mode
Timer 2
and T2OTM–bit
output mode
Timer 2
T2IM
T2IM
T2CTM
T2CTM
Rev. A3, 02-Apr-01
DCGO
TOG2
INT4
POUT
13779
DCGO
TOG2
INT4
13778