Rainbow-electronics AT90LS4433 Uživatelský manuál stáhnout pdf (Strana 34)

AT90S/LS4433

1042G–AVR–09/02

Figure 31. Timer/Counter0 Block Diagram

Timer/Counter0 Control

• Bits 7 – 3 – Res: Reserved Bits

These bits are reserved bits in the AT90S4433 and always read as zero.

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

The Clock Select0 bits 2, 1, and 0 define the prescaling source of Timer/Counter0.

OCIE1

OCF1

Bit 7 6 5 4 3 2 1 0

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

Read/Write R R R R R R/W R/W R/W

Initial Value 0 0 0 0 0 0 0 0

Table 9. Clock 0 Prescale Select

CS02 CS01 CS00 Description

0 0 0 Stop, Timer/Counter0 is stopped.

001CK

010CK/8

011CK/64

100CK/256

101CK/1024

1 1 0 External Pin T0, falling edge

1 1 1 External Pin T0, rising edge

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 124 125

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Rainbow-electronics AT90LS4433 Uživatelský manuál Strana 34