ATMEGA163 datasheet(41/187 Pages) ATMEL

Part #	ATMEGA163

Description	8-bit Microcontroller with 16K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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41

ATmega163(L)

1142E–AVR–02/03

Figure 32. Timer/Counter0 Block Diagram

Timer/Counter0 Control

Register – TCCR0

• Bits 7..3 – Res: Reserved Bits

These bits are reserved bits in the ATmega163 and always read as zero.

• Bits 2..0 – CS02, CS01, CS00: Clock Select0, Bit 2, 1, and 0

The Clock Select0 bits 2,1, and 0 define the prescaling source of Timer0.

The Stop condition provides a Timer Enable/Disable function. The prescaled CK modes

are scaled directly from the CK Oscillator clock. If the external pin modes are used for

Timer/Counter0, transitions on PB0/(T0) will clock the counter even if the pin is config-

ured as an output. This feature can give the user SW control of the counting.

T/C0 CONTROL

REGISTER (TCCR0)

TIMER/COUNTER0

(TCNT0)

0

7

T/C CLK SOURCE

CONTROL

LOGIC

CK

T/C0 OVER-

FLOW IRQ

TIMER INT. MASK

REGISTER (TIMSK)

TIMER INT. FLAG

REGISTER (TIFR)

Bit

76543210

$33 ($53)

–––––

CS02

CS01

CS00

TCCR0

Read/Write

RRRRR

R/W

Initial Value

00000000

Table 11. Clock0 Prescale Select

CS02

CS01

CS00

Description

0

Stop, Timer/Counter0 is stopped.

001

CK

010

CK/8

011

CK/64

100

CK/256

101

CK/1024

1

0

External Pin T0, falling edge

1

External Pin T0, rising edge

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