at94k10al ATMEL Corporation, at94k10al Datasheet - Page 101

• Manufacturer Part Number: at94k10al
• Description: At94k05al 5k - 40k Gates Of At40k Fpga With 8-bit Microcontroller, Up To 36k Bytes Of Sram And On-chip Jtag Ice
• Manufacturer: ATMEL Corporation

4.26
Figure 4-31. Timer/Counter1 Block Diagram
1138I–FPSLI–1/08
Timer/Counter1
REGISTER (TIMSK)
15
15
15
15
TIMER INT. MASK
TIMER/COUNTER1 OUTPUT COMPARE REGISTER A
T/C1 OVER-
T/C1 INPUT CAPTURE REGISTER (ICR1)
FLOW IRQ
TIMER/COUNTER1 (TCNT1)
16 BIT COMPARATOR
Figure 4-31
The 16-bit Timer/Counter1 can select the clock source from CK, prescaled CK, or an external
pin. In addition it can be stopped as described in section
TCCR1B” on page
are found in the Timer/Counter Interrupt Flag Register – TIFR. Control signals are found in the
Timer/Counter1 Control Registers – TCCR1A and TCCR1B. The interrupt enable/disable set-
tings for Timer/Counter1 are found in the Timer/Counter Interrupt Mask Register – TIMSK.
When Timer/Counter1 is externally clocked, the external signal is synchronized with the oscilla-
tor frequency of the CPU. To assure proper sampling of the external clock, the minimum time
between two external clock transitions must be at least one internal CPU clock period. The
external clock signal is sampled on the rising edge of the internal CPU clock.
The 16-bit Timer/Counter1 features both a high-resolution and a high-accuracy usage with the
lower prescaling opportunities. Similarly, the high-prescaling opportunities makes the
T/C1 COMPARE
8
MATCHA IRQ
8
8
8
7
7
7
7
TIMER INT. FLAG
REGISTER (TIFR)
shows the block diagram for Timer/Counter1.
T/C1 COMPARE
MATCHB IRQ
104. The different status flags (overflow, compare match and capture event)
CAPTURE
TRIGGER
0
0
0
0
REGISTER A (TCCR1A)
15
15
TIMER/COUNTER1 OUTPUT COMPARE REGISTER B
T/C CLEAR
T/C CLOCK SOURCE
UP/DOWN
T/C1 CONTROL
CAPTURE IRQ
T/C1 INPUT
16 BIT COMPARATOR
CONTROL
AT94KAL Series FPSLIC
LOGIC
8
8
7
7
REGISTER B (TCCR1B)
T/C1 CONTROL
“Timer/Counter1 Control Register B –
0
0
SPECIAL FUNCTIONS
IO REGISTER (SFIOR)
T1
CK
101