Rainbow-electronics ATmega163L Bedienungsanleitung PDF herunterladen (Seite 35)

ATmega163(L)

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

Bit 76543210

$33 ($53) - - - - - CS02 CS01 CS00 TCCR0

Read/Write RRRRRR/WR/WR/W

Initial value 00000000

Table 11. Clock 0 Prescale Select

CS02 CS01 CS00 Description

0 0 0 Stop, Timer/Counter0 is stopped.

00 1CK

01 0CK / 8

01 1CK / 64

1 0 0 CK / 256

1 0 1 CK / 1024

1 1 0 External Pin T0, falling edge

1 1 1 External Pin T0, rising edge

8-BIT DA

TA BUS

T/C0 CONTROL

TIMER/COUNTER0

(TCNT0)

T/C CLK SOURCE

CONTROL

LOGIC

CS02

CS01

CS00

T/C0 OVER-

FLOW IRQ

TIMER INT. MASK

TOIE0

TOIE1

OCIE1A

OCIE1B

TICIE1

TOIE2

OCIE2

TIMER INT. FLAG

TOV0

TOV1

OCF1A

OCF1B

ICF1

TOV2

OCF2

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 155 156

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