AT90S8515-8JI Atmel, AT90S8515-8JI Datasheet - Page 34

• 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 Counter0 – TCNT0
16-bit Timer/Counter1
34
AT90S8515
The Stop condition provides a Timer Enable/Disable function. The CK down divided
modes are scaled directly from the CK oscillator clock. If the external pin modes are
used for Timer/Counter0, transitions on PB0/(T0) will clock the counter even if the pin is
configured as an output. This feature can give the user software control of the counting.
The Timer/Counter0 is realized as an up-counter with read and write access. If the
Timer/Counter0 is written and a clock source is present, the Timer/Counter0 continues
counting in the clock cycle following the write operation.
Figure 30 shows the block diagram for Timer/Counter1.
Figure 30. Timer/Counter1 Block Diagram
The 16-bit Timer/Counter1 can select clock source from CK, prescaled CK or an exter-
nal pin. In addition, it can be stopped as described in the specification for the
Timer/Counter1 Control Registers (TCCR1A and TCCR1B). The different status flags
(overflow, compare match and capture event) are found in the Timer/Counter Interrupt
Flag Register (TIFR). Control signals are found in the Timer/Counter1 Control Registers
Bit
$32 ($52)
Read/Write
Initial Value
MSB
R/W
7
0
R/W
6
0
R/W
5
0
R/W
4
0
R/W
3
0
R/W
2
0
R/W
1
0
LSB
R/W
0
0
0841G–09/01
TCNT0
T1