ATtiny261-ESSZ datasheet(93/227 Pages) ATMEL

93 / 227 page

7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

Figure 16-1. Timer/Counter1 Block Diagram

16.2.1

Speed

The maximum speed of the Timer/Counter1 is 64 MHz. However, if a supply voltage below 2.7

volts is used, it is recommended to use the Low Speed Mode (LSM), because the

Timer/Counter1 is not running fast enough on low voltage levels. In the Low Speed Mode the

fast peripheral clock is scaled down to 32 MHz. For more details about the Low Speed Mode,

see “PLLCSR – PLL Control and Status Register” on page 90.

16.2.2

Accuracy

The Timer/Counter1 is a 10-bit Timer/Counter module that can alternatively be used as an 8-bit

Timer/Counter. The Timer/Counter1 registers are basically 8-bit registers, but on top of that

there is a 2-bit High Byte Register (TC1H) that can be used as a common temporary buffer to

access the two MSBs of the 10-bit Timer/Counter1 registers by the AVR CPU via the 8-bit data

bus, if the 10-bit accuracy is used. Whereas, if the two MSBs of the 10-bit registers are written to

zero the Timer/Counter1 is working as an 8-bit Timer/Counter. When reading the low byte of any

8-bit register the two MSBs are written to the TC1H register, and when writing the low byte of

any 8-bit register the two MSBs are written from the TC1H register. Special procedures must be

followed when accessing the 10-bit Timer/Counter1 values via the 8-bit data bus. These proce-

dures are described in the section “Accessing 10-Bit Registers” on page 112.

8-BIT DATABUS

T/C INT. FLAG

10-BIT COMPARATOR

8-BIT OUTPUT COMPARE

T/C INT. MASK

TIMER/COUNTER1

(TCNT1)

DIRECTION

TIMER/COUNTER1 CONTROL LOGIC

TOV1

OCF1B

OC1A

OCF1A

T/C CONTROL

10-BIT COMPARATOR

8-BIT OUTPUT COMPARE

T/C CONTROL

OC1A

OC1B

DEAD TIME GENERATOR

10-BIT COMPARATOR

8-BIT OUTPUT COMPARE

10-BIT COMPARATOR

8-BIT OUTPUT COMPARE

T/C CONTROL

OCF1D

OC1D

DEAD TIME GENERATOR

OCW1A

OCW1B

OCW1D

2-BIT HIGH BYTE

T/C CONTROL

10-BIT OUTPUT

COMPARE REGISTER B

10-BIT OUTPUT

COMPARE REGISTER C

10-BIT OUTPUT

COMPARE REGISTER D

10-BIT OUTPUT

COMPARE REGISTER A

CLEAR

COUNT

CLK

T/C CONTROL

FAULT_PROTECTION

ATtiny261-ESSZ Scheda tecnica(PDF) 93 Page - ATMEL Corporation

ATtiny261-ESSZ Scheda tecnica(HTML) 93 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Scheda tecnica Scarica

Link URL