ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 229
ATtiny87
Manufacturer Part Number
ATtiny87
Description
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
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8265B–AVR–09/10
Figure 21-1. Parallel programming
Note:
Table 21-9.
Programming Mode
Signal Name in
PAGEL / BS1
RDY / BSY
XA1 / BS2
V
DATA
CC
+12V
XA0
WR
OE
- 0.3V < AV
Pin Name Mapping
PAGEL / BS1
RDY / BSY
XA1 / BS2
CC
+12 V
< Vcc + 0.3V, however, AV
XA0
WR
Pin Name
OE
PA[7:0]
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PB0
PB1
PB2
PB3
RESET / PB7
GND
XTAL1 / PB4
PB5
PB6
I/O
I/O
O
I
I
I
I
I
I
I
Function
Write Pulse (Active low).
XTAL1 Action Bit 0
- XTAL1 Action Bit 1
- Byte Select 2
- Program Memory and EEPROM data Page Load
- Byte Select 1
XTAL1 (Clock input)
Output Enable (Active low).
0: Device is busy programming,
1: Device is ready for new command.
- Reset (Active low)
- Parallel programming mode (+12V).
Bi-directional Data bus (Output when OE is low).
(“0” selects low byte, “1” selects 2’nd high byte)
(“0” selects low byte, “1” selects high byte)
CC
PA7 - PA0
should always be within 4.5 - 5.5V
AVcc
Vcc
+4.5 - +5.5V
+4.5 - +5.5V
DATA
229
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