AT43USB325E-AC Atmel, AT43USB325E-AC Datasheet - Page 47

• Manufacturer Part Number: AT43USB325E-AC
• Description: IC USB KEYBOARD CTRLR HUB 64LQFP
• Manufacturer: Atmel
• Series: AVR®r

Specifications of AT43USB325E-AC

• Applications: Keyboard Controller
• Core Processor: AVR
• Program Memory Type: SRAM (16 kB)
• Controller Series: AT43USB
• Ram Size: 512 x 8
• Interface: SPI, 3-Wire Serial
• Number Of I /o: 42
• Voltage - Supply: 4.4 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

6.4.1
3355C–USB–4/05
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
• 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:
Table 6-2.
Note:
• Bits 3..2 – Res: Reserved Bits
These bits are reserved bits in the AT43USB325 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 6-3.
Initial Value
Read/Write
$2F ($4F)
COM1X1
Bit
PWM11
0
0
1
1
0
0
1
1
1. X = A or B
2. In PWM mode, these bits have a different function. Refer to
description.
COM1A1
Compare 1 Mode Select
PWM Mode Select
R/W
7
0
COM1X0
PWM10
COM1A0
0
1
0
1
0
1
0
1
R/W
6
0
COM1B1
R/W
Description
Timer/Counter1 disconnected from output pin OC1X.
Toggle the OC1X output line.
Clear the OC1X output line (to zero).
Set the OC1X output line (to one).
Description
PWM operation of Timer/Counter1 is disabled.
Timer/Counter1 is an 8-bit PWM.
Timer/Counter1 is a 9-bit PWM.
Timer/Counter1 is a 10-bit PWM.
5
0
(2)
COM1B0
R/W
4
0
R
3
–
0
(1)
R
2
–
0
Table 6-6
(1)
Table
Table
(1)
AT43USB325
PWM11
R/W
1
0
6-3.
for a detailed
6-2.
PWM10
R/W
0
0
(1)
TCCR1A
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