ATTINY88-AU Atmel, ATTINY88-AU Datasheet - Page 107
![MCU AVR 8K ISP FLASH 1.8V 32TQFP](/photos/6/91/69154/313-32-tqfp_sml.jpg)
ATTINY88-AU
Manufacturer Part Number
ATTINY88-AU
Description
MCU AVR 8K ISP FLASH 1.8V 32TQFP
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY88-AU
Core Processor
AVR
Core Size
8-Bit
Speed
12MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, WDT
Number Of I /o
28
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
64 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP, 32-VQFP
Processor Series
ATTINY8x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
2-Wire/I2S/SPI
Maximum Clock Frequency
12 MHz
Number Of Programmable I/os
28
Number Of Timers
2
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATQT600, ATAVRTS2080B
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVR
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATTINY88-AU
Manufacturer:
ATMEL
Quantity:
5 000
Company:
Part Number:
ATTINY88-AU
Manufacturer:
ATMEL
Quantity:
3 000
Part Number:
ATTINY88-AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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12.10 Timer/Counter Timing Diagrams
8008G–AVR–04/11
When changing the TOP value the program must ensure that the new TOP value is higher or
equal to the value of all of the Compare Registers. If the TOP value is lower than any of the
Compare Registers, a compare match will never occur between the TCNT1 and the OCR1x.
As
cal in all periods. Since the OCR1x Registers are updated at BOTTOM, the length of the rising
and the falling slopes will always be equal. This gives symmetrical output pulses and is therefore
frequency correct.
Using the ICR1 Register for defining TOP works well when using fixed TOP values. By using
ICR1, the OCR1A Register is free to be used for generating a PWM output on OC1A. However,
if the base PWM frequency is actively changed by changing the TOP value, using the OCR1A as
TOP is clearly a better choice due to its double buffer feature.
In phase and frequency correct PWM mode, the compare units allow generation of PWM wave-
forms on the OC1x pins. Setting the COM1x[1:0] bits to 0b10 will produce a non-inverted PWM
and an inverted PWM output can be generated by setting the COM1x[1:0] to 0b11 (See
12-4 on page
for the port pin is set as output (DDR_OC1x). The PWM waveform is generated by setting (or
clearing) the OC1x Register at the compare match between OCR1x and TCNT1 when the coun-
ter increments, and clearing (or setting) the OC1x Register at compare match between OCR1x
and TCNT1 when the counter decrements. The PWM frequency for the output when using
phase and frequency correct PWM can be calculated by the following equation:
The N variable represents the prescaler divider (1, 8, 64, 256, or 1024).
The extreme values for the OCR1x Register represents special cases when generating a PWM
waveform output in the phase correct PWM mode. If the OCR1x is set equal to BOTTOM the
output will be continuously low and if set equal to TOP the output will be set to high for non-
inverted PWM mode. For inverted PWM the output will have the opposite logic values. If OCR1A
is used to define the TOP value and COM1A[1:0] = 1, the OC1A output will toggle with a 50%
duty cycle.
The Timer/Counter is a synchronous design and the timer clock (clk
clock enable signal in the following figures. The figures include information on when Interrupt
Flags are set, and when the OCR1x Register is updated with the OCR1x buffer value (only for
modes utilizing double buffering).
Figure 12-9
111). The actual OC1x value will only be visible on the port pin if the data direction
shows the output generated is, in contrast to the phase correct mode, symmetri-
f
OCnxPFCPWM
Figure 12-10
shows a timing diagram for the setting of OCF1x.
=
--------------------------- -
2 N TOP
⋅
f
clk_I/O
⋅
T1
) is therefore shown as a
ATtiny48/88
Table
107
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