ATTINY861A-SU Atmel, ATTINY861A-SU Datasheet - Page 56
ATTINY861A-SU
Manufacturer Part Number
ATTINY861A-SU
Description
IC, MCU, 8BIT, 8K FLASH, 20SOIC
Manufacturer
Atmel
Datasheet
1.ATTINY461A-MU.pdf
(292 pages)
Specifications of ATTINY861A-SU
Controller Family/series
ATtiny
No. Of I/o's
16
Eeprom Memory Size
512Byte
Ram Memory Size
512Byte
Cpu Speed
20MHz
No.
RoHS Compliant
Core Size
8bit
Program Memory Size
8KB
Oscillator Type
External, Internal
Rohs Compliant
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATTINY861A-SUR
Manufacturer:
Atmel
Quantity:
950
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ATtiny261A/461A/861A
Figure 10-3. Synchronization when Reading an Externally Applied Pin value
Consider the clock period starting shortly after the first falling edge of the system clock. The latch
is closed when the clock is low, and goes transparent when the clock is high, as indicated by the
shaded region of the “SYNC LATCH” signal. The signal value is latched when the system clock
goes low. It is clocked into the PINxn Register at the succeeding positive clock edge. As indi-
cated by the two arrows tpd,max and tpd,min, a single signal transition on the pin will be delayed
between ½ and 1½ system clock period depending upon the time of assertion.
When reading back a software assigned pin value, a nop instruction must be inserted as indi-
cated in
the clock. In this case, the delay tpd through the synchronizer is one system clock period.
Figure 10-4. Synchronization when Reading a Software Assigned Pin Value
INSTRUCTIONS
INSTRUCTIONS
SYSTEM CLK
SYSTEM CLK
SYNC LATCH
SYNC LATCH
Figure
PINxn
PINxn
10-4. The out instruction sets the “SYNC LATCH” signal at the positive edge of
r17
r16
r17
out PORTx, r16
XXX
t
pd, max
0x00
0x00
XXX
nop
t
pd
t
0xFF
pd, min
in r17, PINx
in r17, PINx
8197B–AVR–01/10
0xFF
0xFF
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