AT89LP6440 Atmel Corporation, AT89LP6440 Datasheet - Page 165

• Manufacturer Part Number: AT89LP6440
• Manufacturer: Atmel Corporation

Specifications of AT89LP6440

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 38
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 153.8
• Sram (kbytes): 4.25
• Eeprom (bytes): 8192
• Self Program Memory: IAP
• Operating Voltage (vcc): 2.4 to 3.6
• Timers: 3
• Isp: SPI/OCD
• Watchdog: Yes

25.8
Table 25-6.
25.9
25.9.1
3706C–MICRO–2/11
Address
0080H
User Signature and Analog Configuration
Programming Interface Timing
Power-up Sequence
Parameter Name
RC Oscillator Calibration Byte
Analog Configuration Definitions
The User Signature Array contains 256 bytes of non-volatile memory in two 128-byte pages. The
first page of the User Signature Array (0000H–007FH) is available for serial numbers, firmware
revision information, date codes or other user parameters. The User Signature Array may only
be written by an external device when the User Signature Programming Fuse is enabled. When
the fuse is enabled, Chip Erase will also erase the first page of the array. When the fuse is dis-
abled, the array is not affected by write or erase commands. Programming of the Signature
Array can also be disabled by the Lock Bits. However, reading the signature is always allowed
and the array should not be used to store security sensitive information. The User Signature
Array may be modified during execution through the In-Application Programming interface,
regardless of the state of the User Signature Programming fuse or Lock Bits, provided that the
IAP Fuse is enabled. Note that the address of the User Signature Array, as seen by the IAP
interface, equals the User Signature address plus 256 (0100H–01FFH instead of 0000H–
00FFH).
The second page of the User Signature Array (0080H–00FFH) contains analog configuration
parameters for the AT89LP3240/6440. Each byte represents a parameter as listed in
and is preset in the factory. The parameters are read at POR and the device is configured
accordingly. The second page of the array is not affected by Chip Erase. Other bytes in this
page may be used as additional signature space; however, care should be taken to preserve the
parameter values when modifying other bytes.
This section details general system timing sequences and constraints for entering or exiting In-
System Programming as well as parameters related to the Serial Peripheral Interface during
ISP. The general timing parameters for the following waveform figures are listed in section
ing Parameters” on page
Execute this sequence to enter programming mode immediately after power-up. In the RST pin
is disabled or if the ISP Fuse is disabled, this is the only method to enter programming (see
“External Reset” on page
1. Apply power between VDD and GND pins. RST should remain low.
2. Wait at least t
3. Wait at least t
4. Start programming session.
depend on the current settings of the device.
PWRUP
SUT
Description
The RC Calibration Byte controls the frequency of the internal RC oscillator. The
frequency is inversely proportional to the calibration value such that higher values
result in lower frequencies. A copy of the factory-set calibration value is stored at
location 0008H of the Atmel Signature.
for the internal Power-on Reset to complete. The value of t
. and drive SS high.
169.
35).
AT89LP3240/6440
SUT
Table 25-6
will
“Tim-
165