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AT90S4433 Datasheet(PDF) 37 Page - ATMEL Corporation

Part No. AT90S4433
Description  8-Bit AVR Microcontroller with 4K Bytes of In-System Programmable Flash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90S4433 Datasheet(HTML) 37 Page - ATMEL Corporation

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AT90S/LS4433
1042H–AVR–04/03
Timer/Counter1 Control
Register A – TCCR1A
• Bits 7, 6 – COM11, COM10: Compare Output Mode1, Bits 1, and 0
The COM11 and COM10 control bits determine any output pin action following a
Compare Match in Timer/Counter1. Any output pin actions affect pin OC1 (Output
Compare pin 1). This is an alternative function to an I/O port, and the corresponding
direction control bit must be set (one) to control an output pin. The control configuration
is shown in Table 10.
In PWM mode, these bits have a different function. Refer to Table 11 for a detailed
description.
• Bits 5..2 – Res: Reserved Bits
These bits are reserved bits in the AT90S4433 and always read as zero.
• Bits 1, 0 – PWM11, PWM10: Pulse Width Modulator Select Bits
These bits select PWM operation of Timer/Counter1 as specified in Table 11. This mode
is described on page 41.
Bit
7
6
5
4
3
2
1
0
$2F ($4F)
COM11
COM10
PWM11
PWM10
TCCR1A
Read/Write
R/W
R/W
R
R
R
R
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Table 10. Compare 1 Mode Select
COM11
COM10
Description
0
0
Timer/Counter1 disconnected from output pin OC1
0
1
Toggle the OC1 output line.
1
0
Clear the OC1 output line (to zero).
1
1
Set the OC1 output line (to one).
Table 11. 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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