參數(shù)資料
型號： AT43USB355M-AU
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
中文描述： 8-BIT, MROM, 12 MHz, RISC MICROCONTROLLER, PQFP64
封裝： 1.40 MM, GREEN, PLASTIC, MS-026ACB, LQFP-64
文件頁數(shù)： 44/115頁
文件大?。?/td> 610K
代理商： AT43USB355M-AU
44
AT43USB355
2603G–USB–04/06
Timer/Counter1 Control Register A – TCCR1A
Bits 7, 6
–
COM1A1, COM1A0: Compare Output Mode1A, Bits 1 and 0
The COM1A1 and COM1A0 control bits determine any output pin action following a compare
match in Timer/Counter1. Any output pin actions affect pin OC1A (Output CompareA) pin 1.
This is an alternative function to an I/O port and the corresponding direction control bit must be
set (one) to control the output pin. The control configuration is shown in Table 12.
Bits 5, 4
–
COM1B1, COM1B0: Compare Output Mode1B, Bits 1 and 0
The COM1B1 and COM1B0 control bits determine any output pin action following a compare
match in Timer/Counter1. Any output pin actions affect pin OC1B (Output CompareB). The fol-
lowing control configuration is given:
Note:
1. X = A or B
2. In PWM mode, these bits have a different function. Refer to Table 16 for a detailed
description.
Bits 3..2
–
Res: Reserved Bits
These bits are reserved bits in the AT43USB355 and always read zero.
Bits 1..0
–
PWM11, PWM10: Pulse Width Modulator Select Bits 1 and 0
These bits select PWM operation of Timer/Counter1 as specified in Table 13.
Bit
7
6
5
4
3
2
1
0
$2F ($4F)
COM1A1
COM1A0
COM1B1
COM1B0
–
–
PWM11
PWM10
TCCR1A
Read/Write
R/W
R/W
R/W
R/W
R
R
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Table 12.
Compare 1 Mode Select
(2)
COM1X1
COM1X0
Description
0
0
Timer/Counter1 disconnected from output pin OC1X.
(1)
0
1
Toggle the OC1X output line.
(1)
1
0
Clear the OC1X output line (to zero).
(1)
1
1
Set the OC1X output line (to one).
(1)
Table 13.
PWM Mode Select
PWM11
PWM10
Description
0
0
PWM operation of Timer/Counter1 is disabled.
0
1
Timer/Counter1 is an 8-bit PWM.
1
0
Timer/Counter1 is a 9-bit PWM.
1
1
Timer/Counter1 is a 10-bit PWM.
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