ATTINY87-15XZ Atmel, ATTINY87-15XZ Datasheet - Page 64

• Manufacturer Part Number: ATTINY87-15XZ
• Description: MCU AVR 8K FLASH 15MZ 20-TSSOP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY87-15XZ

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, LIN, SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.3.3
8.3.4
64
ATtiny87/ATtiny167
External Interrupt Flag Register – EIFR
Pin Change Interrupt Control Register – PCICR
• Bit 1 – INT1: External Interrupt Request 1 Enable
When the INT1 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), the
external pin interrupt is enabled. The Interrupt Sense Control1 bits 1/0 (ISC11 and ISC10) in
the External Interrupt Control Register A (EICRA) define whether the external interrupt is acti-
vated on rising and/or falling edge of the INT1 pin or level sensed. Activity on the pin will cause
an interrupt request even if INT1 is configured as an output. The corresponding interrupt of
External Interrupt Request 1 is executed from the INT1 Interrupt Vector.
• Bit 0 – INT0: External Interrupt Request 0 Enable
When the INT0 bit is set (one) and the I-bit in the Status Register (SREG) is set (one), the
external pin interrupt is enabled. The Interrupt Sense Control0 bits 1/0 (ISC01 and ISC00) in
the External Interrupt Control Register A (EICRA) define whether the external interrupt is acti-
vated on rising and/or falling edge of the INT0 pin or level sensed. Activity on the pin will cause
an interrupt request even if INT0 is configured as an output. The corresponding interrupt of
External Interrupt Request 0 is executed from the INT0 Interrupt Vector.
• Bit 7, 2 – Res: Reserved Bits
These bits are unused bits in the ATtiny87/167, and will always read as zero.
• Bit 1 – INTF1: External Interrupt Flag 1
When an edge or logic change on the INT1 pin triggers an interrupt request, INTF1 becomes
set (one). If the I-bit in SREG and the INT1 bit in EIMSK are set (one), the MCU will jump to
the corresponding Interrupt Vector. The flag is cleared when the interrupt routine is executed.
Alternatively, the flag can be cleared by writing a logical one to it. This flag is always cleared
when INT1 is configured as a level interrupt.
• Bit 0 – INTF0: External Interrupt Flag 0
When an edge or logic change on the INT0 pin triggers an interrupt request, INTF0 becomes
set (one). If the I-bit in SREG and the INT0 bit in EIMSK are set (one), the MCU will jump to
the corresponding Interrupt Vector. The flag is cleared when the interrupt routine is executed.
Alternatively, the flag can be cleared by writing a logical one to it. This flag is always cleared
when INT0 is configured as a level interrupt.
• Bit 7, 2 – Res: Reserved Bits
These bits are unused bits in the ATtiny87/167, and will always read as zero.
Read/Write
Initial Value
Read/Write
Initial Value
Bit
Bit
R
R
7
–
0
7
–
0
R
R
6
–
0
6
–
0
R
R
5
–
0
5
–
0
R
R
4
–
0
4
–
0
R
R
3
–
0
3
–
0
R
R
2
–
0
2
–
0
PCIE1
INTF1
R/W
R/W
1
0
1
0
INTF0
PCIE0
R/W
R/W
0
0
0
0
7728G–AVR–06/10
PCICR
EIFR