AT90S2313-4PI Atmel, AT90S2313-4PI Datasheet - Page 29

• Manufacturer Part Number: AT90S2313-4PI
• Description: IC MCU 2K 4MHZ UART LV IT 20DIP
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S2313-4PI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 15
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

Timer/Counter0 Control
Register – TCCR0
Timer/Counter0 – TCNT0
0839I–AVR–06/02
• Bits 7..3 – Res: Reserved Bits
These bits are reserved bits in the AT90S2313 and always read zero.
• Bits 2,1,0 – CS02, CS01, CS00: Clock Select0, Bit 2,1 and 0
The Clock Select0 bits 2, 1, and 0 define the prescaling source of Timer/Counter0.
Table 7. Clock 0 Prescale Select
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 PD4/(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 timer clock cycle following the write operation.
Bit
$33 ($53)
Read/Write
Initial value
Bit
$32 ($52)
Read/Write
Initial value
CS02
0
0
0
0
1
1
1
1
MSB
CS01
R/W
R
7
–
0
7
0
0
0
1
1
0
0
1
1
R/W
R
6
–
0
6
0
CS00
0
1
0
1
0
1
0
1
R/W
5
–
R
0
5
0
Description
Stop, the Timer/Counter0 is stopped.
CK
CK/8
CK/64
CK/256
CK/1024
External Pin T0, falling edge
External Pin T0, rising edge
R/W
4
0
R
4
–
0
R/W
3
0
R
3
–
0
R/W
2
0
CS02
R/W
2
0
R/W
1
0
CS01
AT90S2313
R/W
1
0
LSB
R/W
CS00
R/W
0
0
0
0
TCNT0
TCCR0
29