at90ls4433 ATMEL Corporation, at90ls4433 Datasheet - Page 37

• Manufacturer Part Number: at90ls4433
• Description: At90s4433 8-bit Avr Microcontroller With 4k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

Timer/Counter1 Control
Register A – TCCR1A
1042H–AVR–04/03
• 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.
Table 10. Compare 1 Mode Select
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.
Table 11. PWM Mode Select
Bit
$2F ($4F)
Read/Write
Initial Value
COM11
PWM11
0
0
1
1
0
0
1
1
COM11
R/W
7
0
COM10
PWM10
0
1
0
1
0
1
0
1
COM10
R/W
6
0
Description
Timer/Counter1 disconnected from output pin OC1
Toggle the OC1 output line.
Clear the OC1 output line (to zero).
Set the OC1 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
R
5
–
0
–
R
4
0
R
3
–
0
R
2
–
0
AT90S/LS4433
PWM11
R/W
1
0
PWM10
R/W
0
0
TCCR1A
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