ATxmega16A4 Atmel Corporation, ATxmega16A4 Datasheet - Page 272

• Manufacturer Part Number: ATxmega16A4
• Manufacturer: Atmel Corporation

Specifications of ATxmega16A4

• Flash (kbytes): 16 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 34
• Ext Interrupts: 34
• Usb Speed: No
• Usb Interface: No
• Spi: 7
• Twi (i2c): 2
• Uart: 5
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 2
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 3.3
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.6 to 3.6
• Operating Voltage (vcc): 1.6 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 5
• Output Compare Channels: 16
• Input Capture Channels: 16
• Pwm Channels: 16
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

24.6.5
24.6.6
24.7
24.7.1
8077H–AVR–12/09
SRAM LPC Configuration
Address Latch Requirements
Timing
Multiplexing Data with Address Byte 0
Figure 24-5. Multiplexed SRAM connection using ALE1 and ALE2
The Address Latch timing and parameter requirements are described in
277.
SRAM or external memory devices may have different timing requirements. To meet these vary-
ing requirements, each Chip Select can be configured with different wait-states. Timing details is
described in
The SRAM Low Pin Count (LPC) configuration enables EBI to be configured for multiplexing
modes where the data and address lines are multiplexed. Compared to SRAM configuration,
this can further reduce the number of pins required for the EBI. The available configurations is
shown in
Timing and Address Latch requirements is as for SRAM configuration.
When the data byte and address byte 0 (AD[7:0]) are multiplexed, they are output from the same
port, and the ALE1 signal from the device controls the address latch.
Figure 24-6. Multiplexed SRAM LPC connection using ALE1
Section 24.7.1 on page 272
”EBI Timing” on page
EBI
EBI
A[23:16]/
A[19:16]
A[15:8]/
AD[7:0]
A[15:8]
D[7:0]
A[7:0]
ALE1
ALE2
ALE1
277.
through
D
G
Q
Section 24.7.2 on page
D
G
D
G
Q
Q
D[7:0]
A[7:0]
A[15:8]
A[23:16]
D[7:0]
A[7:0]
A[15:8]
A[19:16]
273.
SRAM
SRAM
”EBI Timing” on page
XMEGA A
272