AT90S8515-8JI Atmel, AT90S8515-8JI Datasheet - Page 36

• Manufacturer Part Number: AT90S8515-8JI
• Description: IC MCU 8K FLSH 8MHZ IT 44PLCC
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S8515-8JI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

Timer/Counter1 Control
Register A – TCCR1A
36
AT90S8515
• 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
C o m p a r e A p i n 1 ) . T h i s i s a n a l t e r n a t i v e f u n c t i o n t o a n I / O p o r t a n d t h e
corresponding direction control bit must be set (one) to control the output pin. The con-
trol configuration is shown in Table 8.
• 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 control configuration is given in Table 8.
Table 8. Compare 1 Mode Select
Note:
• Bits 3..2 – Res: Reserved Bits
These bits are reserved bits in the AT90S8515 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 9. This mode
is described on page 40.
Table 9. PWM Mode Select
Bit
$2F ($4F)
Read/Write
Initial Value
COM1X1
PWM11
0
0
1
1
0
0
1
1
X = A or B
In PWM mode, these bits have a different function. Refer to Table 12 on page 40 for a
detailed description.
COM1A1
R/W
7
0
COM1X0
PWM10
0
1
0
1
0
1
0
1
COM1A0
R/W
6
0
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
COM1B1
R/W
5
0
COM1B0
R/W
4
0
R
3
–
0
R
2
–
0
PWM11
R/W
1
0
PWM10
R/W
0
0
0841G–09/01
TCCR1A