attiny24v ATMEL Corporation, attiny24v Datasheet - Page 89

• Manufacturer Part Number: attiny24v
• Description: 8-bit Avr Microcontroller With 2/4/8k Bytes Insystem Programmable Flash
• Manufacturer: ATMEL Corporation

12.2.3
12.3
12.4
8006H–AVR–10/09
Timer/Counter Clock Sources
Counter Unit
Compatibility
The 16-bit Timer/Counter has been updated and improved from previous versions of 16-bit AVR
Timer/Counters. This 16-bit Timer/Counter is fully compatible with the earlier version regarding:
The following control bits have changed name, but have same functionality and register location:
The following bits are added to the 16-bit Timer/Counter Control Registers:
The 16-bit Timer/Counter has improvements that will affect backward compatibility in some spe-
cial cases.
The Timer/Counter can be clocked by an internal or an external clock source. The clock source
is selected by the Clock Select logic which is controlled by the Clock Select (CS12:0) bits
located in the Timer/Counter control Register B (TCCR1B). For details on clock sources and
prescaler, see
The main part of the 16-bit Timer/Counter is the programmable 16-bit bi-directional counter unit.
Figure 12-2 on page 89
Figure 12-2. Counter Unit Block Diagram
• All 16-bit Timer/Counter related I/O Register address locations, including Timer Interrupt
• Bit locations inside all 16-bit Timer/Counter Registers, including Timer Interrupt Registers.
• Interrupt Vectors.
• PWM10 is changed to WGM10.
• PWM11 is changed to WGM11.
• CTC1 is changed to WGM12.
• 1A and 1B are added to TCCR1A.
• WGM13 is added to TCCR1B.
Registers.
TCNTnH (8-bit)
TEMP (8-bit)
TCNTn (16-bit Counter)
DATA BUS
“Timer/Counter Prescaler” on page
TCNTnL (8-bit)
shows a block diagram of the counter and its surroundings.
(8-bit)
Direction
Count
Clear
Control Logic
TOP
115.
BOTTOM
TOVn
(Int.Req.)
clk
Tn
ATtiny24/44/84
Clock Select
( From Prescaler )
Detector
Edge
Tn
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