Rainbow-electronics ATmega8515L Uživatelský manuál stáhnout pdf (Strana 120)

120

ATmega8515(L)

2512A–AVR–04/02

Output Compare Register 1 A

– OCR1AH and OCR1AL

Output Compare Register 1 B

– OCR1BH and OCR1BL

The Output Compare Registers contain a 16-bit value that iscontinuously compared

with the counter value (TCNT1).Amatch can beused to generateanoutput compare

interrupt, or to generate a waveform output on the OC1xpin.

The Output Compare Registers are16-bit in size. To ensurethat both the high andlow

bytes are written simultaneously when the CPUwrites to these registers, theaccess is

performed usingan8-bit temporary highbyte register(TEMP).This temporary register

issharedbyall theother 16-bit registers. See “Accessing 16-bit Registers”onpage 97.

Input Capture Register 1 –

ICR1H and ICR1L

The Input Captureis updatedwith the counter(TCNT1) value each time an event occurs

on the ICP1 pin (or optionally on theAnalog Comparator output for Timer/Counter1).

Theinput capture can beusedfordefining the counter TOPvalue.

The Input Capture Register is 16-bit in size. To ensurethat both the high andlowbytes

are readsimultaneously when the CPU accesses these registers, theaccess isper-

formed using an 8-bit temporary highbyte register(TEMP).This temporary register is

sharedbyall theother 16-bit registers. See “Accessing 16-bit Registers”onpage 97.

Timer/Counter Interrupt Mask

(1)

Note: 1. Thisregistercontains interrupt controlbitsforseveral Timer/Counters, but only

Timer1 bits are described in thissection. The remaining bits are described in their

respective timersections.

• Bit 7 – TOIE1: Timer/Counter1, Overflow Interrupt Enable

When thisbit iswrittentoone, and the I-flag in the Status Register isset (interrupts glo-

bally enabled), theTimer/Counter1overflow interruptis enabled.The corresponding

InterruptVector(see “Interrupts”onpage 51) is executedwhen theTOV1 flag,located

in TIFR, isset.

Bit 76543 210

OCR1A[15:8] OCR1AH

OCR1A[7:0] OCR1AL

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

Initial Value00000000

Bit 76543 210

OCR1B[15:8] OCR1BH

OCR1B[7:0] OCR1BL

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

Initial Value00000000

Bit 76543 210

ICR1[15:8] ICR1H

ICR1[7:0] ICR1L

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

Initial Value00000000

Bit 76543 210

TOIE1 OCIE1A OCIE1B

OCIE2 TICIE1 TOIE2 TOIE0 OCIE0 TIMSK

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

Initial Value00000000

1 2 ... 115 116 117 118 119 120 121 122 123 124 125 ... 222 223

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