ATMEGA16M1-AU Atmel, ATMEGA16M1-AU Datasheet - Page 304

• Manufacturer Part Number: ATMEGA16M1-AU
• Description: IC MCU AVR 16K FLASH 32TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16M1-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: CAN, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• 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 11x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -

27.10.2
27.10.3
304
ATmega16M1/32M1/64M1
Data Polling Flash
Data Polling EEPROM
When a page is being programmed into the Flash, reading an address location within the page
being programmed will give the value 0xFF. At the time the device is ready for a new page, the
programmed value will read correctly. This is used to determine when the next page can be writ-
ten. Note that the entire page is written simultaneously and any address within the page can be
used for polling. Data polling of the Flash will not work for the value 0xFF, so when programming
this value, the user will have to wait for at least t
a chip-erased device contains 0xFF in all locations, programming of addresses that are meant to
contain 0xFF, can be skipped. See
When a new byte has been written and is being programmed into EEPROM, reading the
address location being programmed will give the value 0xFF. At the time the device is ready for
a new byte, the programmed value will read correctly. This is used to determine when the next
byte can be written. This will not work for the value 0xFF, but the user should have the following
in mind: As a chip-erased device contains 0xFF in all locations, programming of addresses that
are meant to contain 0xFF, can be skipped. This does not apply if the EEPROM is re-pro-
grammed without chip erasing the device. In this case, data polling cannot be used for the value
0xFF, and the user will have to wait at least t
Table 27-17
Table 27-17. Minimum Wait Delay Before Writing the Next Flash or EEPROM Location
Symbol
t
t
t
4. The Flash is programmed one page at a time. The memory page is loaded one byte at
5. The EEPROM array is programmed one byte at a time by supplying the address and
6. Any memory location can be verified by using the Read instruction which returns the
7. At the end of the programming session, RESET can be set high to commence normal
8. Power-off sequence (if needed):
WD_FLASH
WD_EEPROM
WD_ERASE
four bytes of the instruction must be transmitted. If the 0x53 did not echo back, give
RESET a positive pulse and issue a new Programming Enable command
a time by supplying the 6 LSB of the address and data together with the Load Program
Memory Page instruction. To ensure correct loading of the page, the data low byte must
be loaded before data high byte is applied for a given address. The Program Memory
Page is stored by loading the Write Program Memory Page instruction with the 8 MSB
of the address. If polling is not used, the user must wait at least t
the next page (see
Flash write operation completes can result in incorrect programming
data together with the appropriate Write instruction. An EEPROM memory location is
first automatically erased before new data is written. If polling is not used, the user must
wait at least t
device, no 0xFFs in the data file(s) need to be programmed
content at the selected address at serial output MISO
operation
Set RESET to “1”
Turn V
CC
for t
power off
WD_EEPROM
WD_EEPROM
Table
value.
before issuing the next byte (see
27-17). Accessing the serial programming interface before the
Table 27-17
WD_EEPROM
WD_FLASH
for t
WD_FLASH
Minimum Wait Delay
before programming the next byte. See
before programming the next page. As
value.
Table
4.5ms
3.6ms
9.0ms
27-17). In a chip erased
WD_FLASH
before issuing
8209D–AVR–11/10