參數(shù)資料
型號(hào)： AT90S8535-8PI
廠商： Atmel
文件頁數(shù)： 57/127頁
文件大?。?/td> 0K
描述： IC MCU 8K FLSH 8MHZ A/D IT 40DIP
標(biāo)準(zhǔn)包裝： 18
系列： AVR® 90S
核心處理器： AVR
芯體尺寸： 8-位
速度： 8MHz
連通性： SPI，UART/USART
外圍設(shè)備： 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 8KB（4K x 16）
程序存儲(chǔ)器類型： 閃存
EEPROM 大小： 512 x 8
RAM 容量： 512 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 40-DIP（0.600"，15.24mm）
包裝： 管件
35
AT90S/LS8535
1041H–11/01
16-bit Timer/Counter1
Figure 31 shows the block diagram for Timer/Counter1.
Figure 31. Timer/Counter1 Block Diagram
The 16-bit Timer/Counter1 can select clock source from CK, prescaled CK or an exter-
nal pin. In addition, it can be stopped as described in the specification for the
Timer/Counter1 Control Registers (TCCR1A and TCCR1B). The different status flags
(Overflow, Compare Match and Capture Event) and control signals are found in the
Timer/Counter1 Control Registers (TCCR1A and TCCR1B). The interrupt enable/dis-
able settings for Timer/Counter1 are found in the Timer/Counter Interrupt Mask Register
(TIMSK).
When Timer/Counter1 is externally clocked, the external signal is synchronized with the
oscillator frequency of the CPU. To assure proper sampling of the external clock, the
minimum time between two external clock transitions must be at least one internal CPU
clock period. The external clock signal is sampled on the rising edge of the internal CPU
clock.
The 16-bit Timer/Counter1 features both a high-resolution and a high-accuracy usage
with the lower prescaling opportunities. Similarly, the high prescaling opportunities
makes the Timer/Counter1 useful for lower speed functions or exact timing functions
with infrequent actions.
The Timer/Counter1 supports two Output Compare functions using the Output Compare
Register 1A and B (OCR1A and OCR1B) as the data sources to be compared to the
Timer/Counter1 contents. The Output Compare functions include optional clearing of
8-BIT
D
A
TA
B
U
S
T/C1 CONTROL
REGISTER B (TCCR1B)
T/C1 CONTROL
REGISTER A (TCCR1A)
T/C1 INPUT CAPTURE REGISTER (ICR1)
16 BIT COMPARATOR
TIMER/COUNTER1 OUTPUT COMPARE REGISTER A
TIMER/COUNTER1 OUTPUT COMPARE REGISTER B
TIMER/COUNTER1 (TCNT1)
TIMER INT. FLAG
REGISTER (TIFR)
0
7
8
15
CONTROL
LOGIC
COM1A1
COM1B1
CS12
TO
V
1
TO
V
1
TO
V
0
OCF1A
OCF1B
ICF1
COM1A0
COM1B0
CS1
1
CTC1
PWM1
1
PWM10
ICES1
ICNC1
CS10
CK
T/C1 COMPARE
MATCHA IRQ
T/C1 COMPARE
MATCHB IRQ
T/C1 INPUT
CAPTURE IRQ
T/C1 OVER-
FLOW IRQ
CAPTURE
TRIGGER
T/C CLOCK SOURCE
T/C CLEAR
UP/DOWN
TIMER INT. MASK
REGISTER (TIMSK)
T
OIE0
T
OIE1
OCIE1A
OCIE1B
TICIE1
T
OIE2
TO
V
2
OCIE2
OCF2
T1
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