ATTINY13-20SSI Atmel, ATTINY13-20SSI Datasheet - Page 24

• Manufacturer Part Number: ATTINY13-20SSI
• Description: IC MCU AVR 1K FLASH 20MHZ 8SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY13-20SSI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 6
• Program Memory Size: 1KB (512 x 16)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 64 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (3.9mm Width)
• Data Bus Width: 8 bit
• Data Ram Size: 64 B
• Interface Type: SPI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 2
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 4 Channel
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Connectivity: -
• Lead Free Status / Rohs Status: No
• Other names: ATTINY13-24SSI; ATTINY13-24SSI

6.1.4
6.2
6.2.1
24
Clock Sources
ATtiny13
ADC Clock – clk
External Clock
The ADC is provided with a dedicated clock domain. This allows halting the CPU and I/O clocks
in order to reduce noise generated by digital circuitry. This gives more accurate ADC conversion
results.
The device has the following clock source options, selectable by Flash fuse bits as shown
below. The clock from the selected source is input to the AVR clock generator, and routed to the
appropriate modules.
Table 6-1.
Note:
The various choices for each clocking option is given in the following sections. When the CPU
wakes up from Power-down or Power-save, the selected clock source is used to time the start-
up, ensuring stable Oscillator operation before instruction execution starts. When the CPU starts
from reset, there is an additional delay allowing the power to reach a stable level before com-
mencing normal operation. The Watchdog Oscillator is used for timing this real-time part of the
start-up time. The number of WDT Oscillator cycles used for each time-out is shown in
2.
Table 6-2.
To drive the device from an external clock source, CLKI should be driven as shown in
2. To run the device on an external clock, the CKSEL fuses must be programmed to “00”.
Figure 6-2.
Device Clocking Option
External Clock (see
Calibrated Internal 4.8/9.6 MHz Oscillator (see
Internal 128 kHz Oscillator (see
ADC
1. For all fuses “1” means unprogrammed while “0” means programmed.
Typ Time-out
Device Clocking Options Select
Number of Watchdog Oscillator Cycles
External Clock Drive Configuration
EXTERNAL
64 ms
4 ms
page
SIGNAL
CLOCK
24)
page
26)
page
25)
CLKI
GND
Number of Cycles
8K (8,192)
512
CKSEL1:0
01, 10
00
11
(1)
2535J–AVR–08/10
Figure 6-
Table 6-