ATMEGA64-16AJ Atmel, ATMEGA64-16AJ Datasheet - Page 34
![IC MCU AVR 64K 5V 16MHZ 64-TQFP](/photos/12/13/121332/313-64-tqfp_sml.jpg)
ATMEGA64-16AJ
Manufacturer Part Number
ATMEGA64-16AJ
Description
IC MCU AVR 64K 5V 16MHZ 64-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA64-16AJ
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
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Price
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XMCRB – External
Memory Control
Register B
2490Q–AVR–06/10
• Bit 7 – XMBK: External Memory Bus Keeper Enable
Writing XMBK to one enables the Bus Keeper on the AD7:0 lines. When the Bus Keeper is
enabled, it will ensure a defined logic level (zero or one) on AD7:0 when they would otherwise
be tri-stated. Writing XMBK to zero disables the Bus Keeper. XMBK is not qualified with SRE, so
even if the XMEM interface is disabled, the Bus Keepers are still activated as long as XMBK is
one.
• Bit 6..3 – Res: Reserved Bits
These are reserved bits and will always read as zero. When writing to this address location,
write these bits to zero for compatibility with future devices.
• Bit 2..0 – XMM2, XMM1, XMM0: External Memory High Mask
When the External Memory is enabled, all Port C pins are default used for the high address byte.
If the full 60 Kbytes address space is not required to access the external memory, some, or all,
Port C pins can be released for normal port pin function as described in
“Using all 64Kbytes Locations of External Memory” on page
bits to access all 64 Kbytes locations of the external memory.
Table 5. Port C Pins Released as Normal Port Pins when the External Memory is Enabled
Bit
(0x6C)
Read/Write
Initial Value
XMM2
0
0
0
0
1
1
1
1
XMM1
0
0
1
1
0
0
1
1
XMBK
R/W
7
0
XMM0
0
1
0
1
0
1
0
1
R
6
–
0
# Bits for External Memory Address
8 (Full 60 Kbytes space)
7
6
5
4
3
2
No Address high bits
R
5
–
0
R
4
–
0
R
3
–
0
XMM2
R/W
2
0
36, it is possible to use the XMMn
XMM1
R/W
1
0
Released Port Pins
None
PC7
PC7 - PC6
PC7 - PC5
PC7 - PC4
PC7 - PC3
PC7 - PC2
Full Port C
ATmega64(L)
Table
XMM0
R/W
0
0
5. As described in
XMCRB
34
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