ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 238

• Manufacturer Part Number: ATtiny87
• Manufacturer: Atmel Corporation

Specifications of ATtiny87

• Flash (kbytes): 8 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 16
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.5
• 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: 2
• Output Compare Channels: 3
• Input Capture Channels: 1
• Pwm Channels: 9
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

21.7.15
21.8
238
Serial Downloading
ATtiny87/ATtiny167
Reading the Temperature Sensor Parameter Bytes
The algorithm for reading the Temperature Sensor parameter bytes is as follows (refer to
gramming the Flash” on page 232
Both the Flash and EEPROM memory arrays can be programmed using the serial SPI bus
while RESET is pulled to GND. The serial interface consists of pins SCK, MOSI (input) and
MISO (output). After RESET is set low, the Programming Enable instruction needs to be exe-
cuted first before program/erase operations can be executed.
Note:
Figure 21-7. Serial Programming and Verify
Note:
Table 21-13. Pin Mapping Serial Programming
When programming the EEPROM, an auto-erase cycle is built into the self-timed program-
ming operation (in the Serial mode ONLY) and there is no need to first execute the Chip Erase
instruction. The Chip Erase operation turns the content of every memory location in both the
Program and EEPROM arrays into 0xFF.
1. A: Load Command “0000 1000
2. B: Load Address Low Byte, 0x0003 or 0x0005.
3. Set OE to “0”, and BS1 to “1”. The Temperature Sensor parameter byte can now be
4. Set OE to “1”.
read at DATA.
In
dedicated for the internal SPI interface.
If the device is clocked by the internal Oscillator, it is no need to connect a clock source to the
XTAL1 pin
Symbol
MOSI
MISO
SCK
Table
21-13, the pin mapping for SPI programming is listed. Not all parts use the SPI pins
MOSI
MISO
SCK
Pin Name
PA4
PA2
PA5
for details on Command and Address loading):
PA4
PA2
PA5
RESET / PB7
GND
b
”.
I/O
O
I
I
Function
Serial Data In
Serial Data Out
Serial Clock
(Note:)
Vcc
+1.8 - +5.5V
8265B–AVR–09/10
“Pro-