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ATmega16-16PU Arkusz danych(PDF) 62 Page - ATMEL Corporation

Numer części ATmega16-16PU
Szczegółowy opis  8-bit Microcontroller with 16K Bytes In-Syustem Programmable Flash
Download  357 Pages
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega16-16PU Arkusz danych(HTML) 62 Page - ATMEL Corporation

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62
2466S–AVR–05/09
ATmega16(L)
• SDA – Port C, Bit 1
SDA, Two-wire Serial Interface Data: When the TWEN bit in TWCR is set (one) to enable the
Two-wire Serial Interface, pin PC1 is disconnected from the port and becomes the Serial Data
I/O pin for the Two-wire Serial Interface. In this mode, there is a spike filter on the pin to sup-
press spikes shorter than 50 ns on the input signal, and the pin is driven by an open drain driver
with slew-rate limitation. When this pin is used by the Two-wire Serial Interface, the pull-up can
still be controlled by the PORTC1 bit.
• SCL – Port C, Bit 0
SCL, Two-wire Serial Interface Clock: When the TWEN bit in TWCR is set (one) to enable the
Two-wire Serial Interface, pin PC0 is disconnected from the port and becomes the Serial Clock
I/O pin for the Two-wire Serial Interface. In this mode, there is a spike filter on the pin to sup-
press spikes shorter than 50 ns on the input signal, and the pin is driven by an open drain driver
with slew-rate limitation. When this pin is used by the Two-wire Serial Interface, the pull-up can
still be controlled by the PORTC0 bit.
Table 29 and Table 30 relate the alternate functions of Port C to the overriding signals shown in
Figure 26 on page 55.
Table 29. Overriding Signals for Alternate Functions in PC7..PC4
Signal
Name
PC7/TOSC2
PC6/TOSC1
PC5/TDI
PC4/TDO
PUOE
AS2
AS2
JTAGEN
JTAGEN
PUOV
0
0
1
0
DDOE
AS2
AS2
JTAGEN
JTAGEN
DDOV
0
0
0
SHIFT_IR + SHIFT_DR
PVOE
0
0
0
JTAGEN
PVOV
0
0
0
TDO
DIEOE
AS2
AS2
JTAGEN
JTAGEN
DIEOV
0
0
0
0
DI
AIO
T/C2 OSC OUTPUT
T/C2 OSC INPUT
TDI


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