ATMEGA164P-20MCU Atmel, ATMEGA164P-20MCU Datasheet - Page 270

• Manufacturer Part Number: ATMEGA164P-20MCU
• Description: MCU AVR 16K FLASH 20MHZ 44-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA164P-20MCU

• 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): 2.7 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

8011O–AVR–07/10
The Boundary-scan logic is not included in the figures in the datasheet.
simple digital port pin as described in the section
details from
When no alternate port function is present, the Input Data - ID - corresponds to the PINxn Regis-
ter value (but ID has no synchronizer), Output Data corresponds to the PORT Register, Output
Control corresponds to the Data Direction - DD Register, and the Pull-up Enable - PUExn - cor-
responds to logic expression PUD · DDxn · PORTxn.
Digital alternate port functions are connected outside the dotted box in
scan chain read the actual pin value. For analog function, there is a direct connection from the
external pin to the analog circuit. There is no scan chain on the interface between the digital and
the analog circuitry, but some digital control signal to analog circuitry are turned off to avoid driv-
ing contention on the pads.
When JTAG IR contains EXTEST or SAMPLE_PRELOAD the clock is not sent out on the port
pins even if the CKOUT fuse is programmed. Even though the clock is output when the JTAG IR
contains SAMPLE_PRELOAD, the clock is not sampled by the boundary scan.
Figure 22-3. Boundary-scan Cell for Bi-directional Port Pin with Pull-up Function.
Pull-up Enable (PUE)
Output Control (OC)
Output Data (OD)
Input Data (ID)
Figure 22-3
replaces the dashed box in
0
1
From Last Cell
0
1
0
1
ShiftDR
ClockDR
D
D
FF1
FF0
To Next Cell
Q
Q
ATmega164P/324P/644P
”I/O-Ports” on page
UpdateDR
Figure
D
G
D
G
LD1
LD0
22-4.
Q
Q
0
1
0
1
0
1
EXTEST
Figure 22-4
72. The Boundary-scan
Figure 22-4
Vcc
to make the
shows a
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