attiny15l ATMEL Corporation, attiny15l Datasheet - Page 30

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attiny15l

Manufacturer Part Number
attiny15l
Description
Attiny15l 8-bit Microcontroller With 1k Byte Flash
Manufacturer
ATMEL Corporation
Datasheet

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The Timer/Counter1 – TCNT1
30
ATtiny15L
• Bits 3, 2, 1, 0 – CS13, CS12, CS11, CS10: Clock Select Bits 3, 2, 1, and 0
The Clock Select bits 3, 2, 1, and 0 define the prescaling source of Timer/Counter1.
Table 11. Timer/Counter1 Prescale Select
The Stop condition provides a Timer Enable/Disable function. The prescaled CK modes
are scaled directly from the CK oscillator clock.
This 8-bit register contains the value of Timer/Counter1.
Timer/Counter1 is implemented as an up-counter with read and write access. Due to
synchronization of the CPU and Timer/Counter1, data written into Timer/Counter1 is
delayed by one CPU clock cycle.
Bit
$2F
Read/Write
Initial Value
CS13
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
MSB
R/W
CS12
7
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
R/W
6
0
CS11
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
R/W
5
0
CS10
R/W
4
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
R/W
3
0
Description
Timer/Counter1 is stopped.
CK*16 (=PCK)
CK*8 (=PCK/2)
CK*4 (=PCK/4)
CK*2 (=PCK/8)
CK
CK/2
CK/4
CK/8
CK/16
CK/32
CK/64
CK/128
CK/256
CK/512
CK/1024
R/W
2
0
R/W
1
0
LSB
R/W
0
0
1187H–AVR–09/07
TCNT1

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