ATmega406 Atmel Corporation, ATmega406 Datasheet - Page 199

• Manufacturer Part Number: ATmega406
• Manufacturer: Atmel Corporation

Specifications of ATmega406

• Flash (kbytes): 40 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 1 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 18
• Ext Interrupts: 4
• Usb Speed: No
• Usb Interface: No
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -30 to 85
• I/o Supply Class: 4.0 to 25
• Operating Voltage (vcc): 4.0 to 25
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 3
• Pwm Channels: 2
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

28.6
28.6.1
28.6.2
2548E–AVR–07/06
Parallel Programming
Considerations for Efficient Programming
Signal Names
This section describes parameters, pin mapping, and commands used to parallel program and
verify Flash Program memory, EEPROM Data memory, Memory Lock bits, and Fuse bits in the
ATmega406. Pulses are assumed to be at least 250 ns unless otherwise noted.
The loaded command and address are retained in the device during programming. For efficient
programming, the following should be considered.
• The command needs only be loaded once when writing or reading multiple memory locations.
• Skip writing the data value 0xFF, that is the contents of the entire EEPROM (unless the
Address high byte needs only be loaded before programming or reading a new 256 word window
in Flash or 256 byte EEPROM. This consideration also applies to Signature bytes reading.
In this section, some pins of the ATmega406 are referenced by signal names describing their
functionality during parallel programming, see
200. Pins not described in the following table are referenced by pin names.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse.
The bit coding is shown in
When pulsing WR or OE, the command loaded determines the action executed. The different
Commands are shown in
programming characteristics.
Figure 28-1. Parallel Programming
EESAVE Fuse is programmed) and Flash after a Chip Erase.
RDY/BSY
PAGEL
V
PP
BS2
BS1
XA0
XA1
WR
OE
Table 28-10 on page
Table 28-9 on page
RESET
XTAL1
GND
V
V
V
BATT
PVT
PV1
FET
REG
CC
Figure 28-1 on page 199
200.
201.
Table 28-11 on page 210
+4 - 25V
(3.3V)
DATA
See "Enter Programming Mode"
and
ATmega406
Table 28-7 on page
shows the Parallel
199