ATMEGA164P-20MUR Atmel, ATMEGA164P-20MUR Datasheet - Page 275
ATMEGA164P-20MUR
Manufacturer Part Number
ATMEGA164P-20MUR
Description
MCU AVR 16KB FLASH 20MHZ 44-VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA164P-20MUR
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
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22.8
22.8.1
22.8.2
8011O–AVR–07/10
Register Description
MCUCR – MCU Control Register
MCUSR – MCU Status Register
The MCU Control Register contains control bits for general MCU functions.
• Bits 7 – JTD: JTAG Interface Disable
When this bit is zero, the JTAG interface is enabled if the JTAGEN Fuse is programmed. If this
bit is one, the JTAG interface is disabled. In order to avoid unintentional disabling or enabling of
the JTAG interface, a timed sequence must be followed when changing this bit: The application
software must write this bit to the desired value twice within four cycles to change its value. Note
that this bit must not be altered when using the On-chip Debug system.
The MCU Status Register provides information on which reset source caused an MCU reset.
• Bit 4 – JTRF: JTAG Reset Flag
This bit is set if a reset is being caused by a logic one in the JTAG Reset Register selected by
the JTAG instruction AVR_RESET. This bit is reset by a Power-on Reset, or by writing a logic
zero to the flag.
Bit
0x35 (0x55)
Read/Write
Initial Value
Bit
0x34 (0x54)
Read/Write
Initial Value
JTD
R/W
7
0
R
7
–
0
BODS
R
6
0
R
6
–
0
BODSE
R
5
0
R
5
–
0
JTRF
PUD
R/W
R/W
4
0
4
ATmega164P/324P/644P
WDRF
R/W
R
3
–
0
3
See Bit Description
BORF
R/W
R
2
–
0
2
EXTRF
IVSEL
R/W
R/W
1
0
1
PORF
IVCE
R/W
R/W
0
0
0
MCUCR
MCUSR
275
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