ATTINY13A-MUR Atmel, ATTINY13A-MUR Datasheet - Page 27
![MCU AVR 1KB FLASH 20MHZ 20QFN](/photos/6/87/68751/313-20-qfn_sml.jpg)
ATTINY13A-MUR
Manufacturer Part Number
ATTINY13A-MUR
Description
MCU AVR 1KB FLASH 20MHZ 20QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Datasheet
1.ATTINY13A-SSH.pdf
(176 pages)
Specifications of ATTINY13A-MUR
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)
1.8 V ~ 5.5 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Connectivity
-
Lead Free Status / Rohs Status
Details
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- Download datasheet (5Mb)
6.3.1
6.4
6.4.1
8126E–AVR–07/10
Register Description
Switching Time
OSCCAL – Oscillator Calibration Register
When switching between prescaler settings, the System Clock Prescaler ensures that no
glitches occur in the clock system and that no intermediate frequency is higher than neither the
clock frequency corresponding to the previous setting, nor the clock frequency corresponding to
the new setting.
The ripple counter that implements the prescaler runs at the frequency of the undivided clock,
which may be faster than the CPU’s clock frequency. Hence, it is not possible to determine the
state of the prescaler – even if it were readable, and the exact time it takes to switch from one
clock division to another cannot be exactly predicted.
From the time the CLKPS values are written, it takes between T1 + T2 and T1 + 2*T2 before the
new clock frequency is active. In this interval, 2 active clock edges are produced. Here, T1 is the
previous clock period, and T2 is the period corresponding to the new prescaler setting.
• Bit 7 – Res: Reserved Bit
This bit is reserved bit in ATtiny13A and it will always read zero.
• Bits 6:0 – CAL[6:0]: Oscillator Calibration Value
Writing the calibration byte to this address will trim the internal Oscillator to remove process vari-
ations from the Oscillator frequency. This is done automatically during Chip Reset. When
OSCCAL is zero, the lowest available frequency is chosen. Writing non-zero values to this regis-
ter will increase the frequency of the internal Oscillator. Writing 0x7F to the register gives the
highest available frequency.
The calibrated Oscillator is used to time EEPROM and Flash access. If EEPROM or Flash is
written, do not calibrate to more than 10% above the nominal frequency. Otherwise, the
EEPROM or Flash write may fail. Note that the Oscillator is intended for calibration to 9.6 MHz or
4.8 MHz. Tuning to other values is not guaranteed, as indicated in
To ensure stable operation of the MCU the calibration value should be changed in small steps. A
variation in frequency of more than 2% from one cycle to the next can lead to unpredicatble
behavior. Changes in OSCCAL should not exceed 0x20 for each calibration. It is required to
ensure that the MCU is kept in Reset during such changes in the clock frequency
Table 6-7.
Bit
0x31
Read/Write
Initial Value
OSCCAL Value
0x00
0x3F
0x7F
Internal RC Oscillator Frequency Range
R
7
–
0
with Respect to Nominal Frequency
CAL6
R/W
Typical Lowest Frequency
6
CAL5
R/W
5
100%
50%
75%
Device Specific Calibration Value
CAL4
R/W
4
CAL3
R/W
3
with Respect to Nominal Frequency
CAL2
R/W
2
Typical Highest Frequency
Table 6-7
CAL1
R/W
1
100%
150%
200%
below.
CAL0
R/W
0
OSCCAL
27
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