參數(shù)資料
型號(hào): ATTINY15L-1SU
廠商: Atmel
文件頁數(shù): 25/85頁
文件大小: 0K
描述: IC MCU AVR 1K FLASH 1.6MHZ 8SOIC
標(biāo)準(zhǔn)包裝: 95
系列: AVR® ATtiny
核心處理器: AVR
芯體尺寸: 8-位
速度: 1.6MHz
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 6
程序存儲(chǔ)器容量: 1KB(512 x 16)
程序存儲(chǔ)器類型: 閃存
EEPROM 大小: 64 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 8-SOIC(0.209",5.30mm 寬)
包裝: 管件
31
ATtiny15L
1187H–AVR–09/07
Timer/Counter1 Output
Compare RegisterA – OCR1A
The Output Compare Register 1A is an 8-bit read/write register.
The Timer/Counter Output Compare Register 1A contains the data to be continuously
compared with Timer/Counter1. Actions on compare matches are specified in TCCR1. A
compare match occurs only if Timer/Counter1 counts to the OCR1A value. A software
write that sets TCNT1 and OCR1A to the same value does not generate a compare
match.
A compare match will set (one) the Compare Interrupt Flag in the CPU clock cycle fol-
lowing the compare event.
Timer/Counter1 in PWM Mode
When the PWM mode is selected, Timer/Counter1 and the Output Compare Register A
(OCR1A) form an 8-bit, free-running and glitch-free PWM with outputs on the
PB1(OC1A) pin. Timer/Counter1 acts as an up-counter, counting up from $00 up to the
value specified in the second Output Compare Register OCR1B, and starting from $00
up again. When the counter value matches the contents of the Output Compare Regis-
ter OCR1A, the PB1(OC1A) pin is set or cleared according to the settings of the
COM1A1/COM1A0 bits in the Timer/Counter1 Control Registers TCCR1. Refer to Table
12 for details.
Note that in PWM mode, writing to the Output Compare OCR1A, the data value is first
transferred to a temporary location. The value is latched into OCR1A when the
Timer/Counter reaches OCR1B. This prevents the occurrence of odd-length PWM
pulses (glitches) in the event of an unsynchronized OCR1A write. See Figure 22 for an
example.
Bit
7
6
543
210
$2E
MSB
LSB
OCR1A
Read/Write
R/W
Initial Value
0
Table 12. Compare Mode Select in PWM Mode
COM1A1
COM1A0
Effect on Compare Pin
0
Not connected
0
1
Not connected
10
Cleared on compare match (up-counting) (non-inverted PWM). Set
when TCNT1 = $00.
11
Set on compare match (up-counting) (inverted PWM). Cleared when
TCNT1 = $00.
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