ATMEGA164PA-MCH Atmel, ATMEGA164PA-MCH Datasheet - Page 158
![MCU AVR 16KB FLASH 20MHZ 44-VQFN](/photos/12/13/121316/313-44-qfn_sml.jpg)
ATMEGA164PA-MCH
Manufacturer Part Number
ATMEGA164PA-MCH
Description
MCU AVR 16KB FLASH 20MHZ 44-VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA164PA-MCH
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K 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
44-VQFN Exposed Pad
For Use With
ATSTK600-TQFP44 - STK600 SOCKET/ADAPTER 44-TQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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16.11.3
16.11.4
16.11.5
16.11.6
8272A–AVR–01/10
TCNT2 – Timer/Counter Register
OCR2A – Output Compare Register A
OCR2B – Output Compare Register B
ASSR – Asynchronous Status Register
Table 16-9.
If external pin modes are used for the Timer/Counter0, transitions on the T0 pin will clock the
counter even if the pin is configured as an output. This feature allows software control of the
counting.
The Timer/Counter Register gives direct access, both for read and write operations, to the
Timer/Counter unit 8-bit counter. Writing to the TCNT2 Register blocks (removes) the Compare
Match on the following timer clock. Modifying the counter (TCNT2) while the counter is running,
introduces a risk of missing a Compare Match between TCNT2 and the OCR2x Registers.
The Output Compare Register A contains an 8-bit value that is continuously compared with the
counter value (TCNT2). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC2A pin.
The Output Compare Register B contains an 8-bit value that is continuously compared with the
counter value (TCNT2). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC2B pin.
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Bit
(0xB2)
Read/Write
Initial Value
Bit
(0xB3)
Read/Write
Initial Value
Bit
(0xB4)
Read/Write
Initial Value
Bit
(0xB6)
Read/Write
Initial Value
CS22
0
1
1
1
1
R
7
–
0
Clock Select Bit Description
R/W
R/W
R/W
7
0
7
0
7
0
CS21
EXCLK
1
0
0
1
1
R/W
6
0
R/W
R/W
R/W
6
0
6
0
6
0
R/W
AS2
5
0
CS20
R/W
R/W
R/W
1
0
1
0
1
TCN2UB
5
0
5
0
5
0
R
4
0
R/W
R/W
R/W
Description
clk
clk
clk
clk
clk
4
0
4
0
4
0
OCR2AUB
OCR2A[7:0]
OCR2B[7:0]
TCNT2[7:0]
T2S
T2S
T2S
T
T
2
2
S
S
R
3
0
/256 (From prescaler)
/1024 (From prescaler)
/32 (From prescaler)
/64 (From prescaler)
/128 (From prescaler)
R/W
R/W
R/W
3
0
3
0
3
0
OCR2BUB
R
2
0
R/W
R/W
R/W
2
0
2
0
2
0
TCR2AUB
R/W
R/W
R/W
R
1
0
1
0
1
0
1
0
TCR2BUB
R/W
R/W
R/W
0
0
0
0
0
0
R
0
0
OCR2A
OCR2B
TCNT2
ASSR
158
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