ATMEGA163 ATMEL [ATMEL Corporation], ATMEGA163 Datasheet - Page 124

• Manufacturer Part Number: ATMEGA163
• Description: 8-bit Microcontroller with 16K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Alternate Functions of PORTC • TOSC2 – PORTC, Bit 7
124
ATmega163(L)
Table 48. DDCn Effects on PORT C Pins
Note:
TOSC2, Timer Oscillator pin 2: When the AS2 bit in ASSR is set (one) to enable asyn-
chronous clocking of Timer/Counter2, pin PC7 is disconnected from the port, and
becomes the inverting output of the Oscillator amplifier. In this mode, a crystal Oscillator
is connected to this pin, and the pin can not be used as an I/O pin.
• TOSC1 – PORTC, Bit 6
TOSC1, Timer Oscillator pin 1: When the AS2 bit in ASSR is set (one) to enable asyn-
chronous clocking of Timer/Counter1, pin PC6 is disconnected from the port, and
becomes the input of the inverting Oscillator amplifier. In this mode, a crystal Oscillator
is connected to this pin, and the pin can not be used as an I/O pin.
• SDA – PORTC, Bit 1
SDA, Two-wire Serial Bus 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 capture spikes shorter than 50 ns on the input signal, and the pin is driven by an
open collector driver with slew rate limitation.
• SCL – PORTC, 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 PC1 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 capture spikes shorter than 50 ns on the input signal.
DDCn
0
0
0
1
1
1. n: 7…0, pin number
PORTCn
0
1
1
0
1
PUD
1
0
x
x
x
Output
Output
Input
Input
Input
I/O
Pull Up
Yes
No
No
No
No
(1)
Comment
Tri-state (Hi-Z)
Tri-state (Hi-Z)
PCn will source current if ext. pulled low.
Push-pull Zero Output
Push-pull One Output
1142E–AVR–02/03