ATTINY84V-10PU Atmel, ATTINY84V-10PU Datasheet - Page 131

• Manufacturer Part Number: ATTINY84V-10PU
• Description: AVR MCU, 8K FLASH, 512B RAM, 512B EE
• Manufacturer: Atmel

Specifications of ATTINY84V-10PU

• Controller Family/series: AVR Tiny
• No. Of I/o's: 12
• Eeprom Memory Size: 512Byte
• Ram Memory Size: 1KB
• Cpu Speed: 10MHz
• Core Size: 8bit
• Program Memory Size: 8KB
• Oscillator Type: External, Internal
• Processor Series: ATTINY8x
• Core: AVR8
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Data Ram Size: 512 B
• Interface Type: SPI
• Maximum Clock Frequency: 10 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Package / Case: PDIP-14
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

16.5.4
8006F–AVR–02/07
USICR – USI Control Register
An interrupt will be generated when the flag is set while the USISIE bit in USICR and the Global
Interrupt Enable Flag are set. The flag will only be cleared by writing a logical one to the USISIF
bit. Clearing this bit will release the start detection hold of USCL in Two-wire mode.
A start condition interrupt will wakeup the processor from all sleep modes.
• Bit 6 – USIOIF: Counter Overflow Interrupt Flag
This flag is set (one) when the 4-bit counter overflows (i.e., at the transition from 15 to 0). An
interrupt will be generated when the flag is set while the USIOIE bit in USICR and the Global
Interrupt Enable Flag are set. The flag is cleared if a one is written to the USIOIF bit or by read-
ing the USIBR register. Clearing this bit will release the counter overflow hold of SCL in Two-
wire mode.
A counter overflow interrupt will wakeup the processor from Idle sleep mode.
• Bit 5 – USIPF: Stop Condition Flag
When Two-wire mode is selected, the USIPF Flag is set (one) when a stop condition is detected.
The flag is cleared by writing a one to this bit. Note that this is not an Interrupt Flag. This signal is
useful when implementing Two-wire bus master arbitration.
• Bit 4 – USIDC: Data Output Collision
This bit is logical one when bit 7 in the Shift Register differs from the physical pin value. The flag
is only valid when Two-wire mode is used. This signal is useful when implementing Two-wire
bus master arbitration.
• Bits 3..0 – USICNT3..0: Counter Value
These bits reflect the current 4-bit counter value. The 4-bit counter value can directly be read or
written by the CPU.
The 4-bit counter increments by one for each clock generated either by the external clock edge
detector, by a Timer/Counter0 Compare Match, or by software using USICLK or USITC strobe
bits. The clock source depends of the setting of the USICS1..0 bits. For external clock operation
a special feature is added that allows the clock to be generated by writing to the USITC strobe
bit. This feature is enabled by write a one to the USICLK bit while setting an external clock
source (USICS1 = 1).
Note that even when no wire mode is selected (USIWM1..0 = 0) the external clock input
(USCK/SCL) are can still be used by the counter.
The Control Register includes interrupt enable control, wire mode setting, Clock Select setting,
and clock strobe.
• Bit 7 – USISIE: Start Condition Interrupt Enable
Setting this bit to one enables the Start Condition detector interrupt. If there is a pending inter-
rupt when the USISIE and the Global Interrupt Enable Flag is set to one, this will immediately be
Bit
0x0D (0x2D)
Read/Write
Initial Value
USISIE
R/W
7
0
USIOIE
R/W
6
0
USIWM1
R/W
5
0
USIWM0
R/W
4
0
USICS1
R/W
3
0
USICS0
R/W
2
0
ATtiny24/44/84
USICLK
W
1
0
USITC
W
0
0
USICR
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