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ATMEGA16-16MC Datasheet(PDF) 59 Page - ATMEL Corporation

Part No. ATMEGA16-16MC
Description  8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash
Download  315 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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ATMEGA16-16MC Datasheet(HTML) 59 Page - ATMEL Corporation

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59
ATmega16(L)
2466E–AVR–10/02
• 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 suppress 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 suppress 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 52.
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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