ATmega162 Atmel Corporation, ATmega162 Datasheet - Page 26

• Manufacturer Part Number: ATmega162
• Manufacturer: Atmel Corporation

Specifications of ATmega162

• Flash (kbytes): 16 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 35
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 6
• Input Capture Channels: 2
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

External Memory
Interface
Overview
Using the External
Memory Interface
26
ATmega162/V
With all the features the External Memory Interface provides, it is well suited to operate as an
interface to memory devices such as external SRAM and FLASH, and peripherals such as LCD-
display, A/D, and D/A. The main features are:
•
•
•
•
When the eXternal MEMory (XMEM) is enabled, address space outside the internal SRAM
becomes available using the dedicated external memory pins (see
on page
shown in
Figure 11. External Memory with Sector Select
Note:
The interface consists of:
•
•
•
•
•
Four Different Wait-state Settings (Including No Wait-state)
Independent Wait-state Setting for Different External Memory Sectors (Configurable Sector Size)
The Number of Bits Dedicated to Address High Byte is Selectable
Bus Keepers on Data Lines to Minimize Current Consumption (Optional)
AD7:0: Multiplexed low-order address bus and data bus
A15:8: High-order address bus (configurable number of bits)
ALE: Address latch enable
RD: Read strobe.
WR: Write strobe.
1. Address depends on the ATmega161 compatibility Fuse. See
70,
Figure
18
Table 35 on page
and
11.
Figure 9 on page 19
External Memory
(0-64K x 8)
75, and
for details.
Table 41 on page
Internal Memory
Lower Sector
Upper Sector
SRW01
SRW00
SRW11
SRW10
0x0000
0x04FF/0x045F
0x0500/0x0460
0xFFFF
81). The memory configuration is
SRL[2..0]
Figure 1 on page
“SRAM Data Memory” on page
(1)
(1)
2513K–AVR–07/09
2,
Table 29