Datasheet

85
7674F–AVR–09/09
ATmega164P/324P/644P
• TMS/PCINT19 – Port C, Bit 3
TMS, JTAG Test Mode Select.
PCINT19, Pin Change Interrupt source 19: The PC3 pin can serve as an external interrupt
source.
• TCK/PCINT18 – Port C, Bit 2
TCK, JTAG Test Clock.
PCINT18, Pin Change Interrupt source 18: The PC2 pin can serve as an external interrupt
source.
• SDA/PCINT17 – Port C, Bit 1
SDA, 2-wire Serial Bus Data Input/Output Line.
PCINT17, Pin Change Interrupt source 17: The PC1 pin can serve as an external interrupt
source.
• SCL/PCINT16 – Port C, Bit 0
SCL, 2-wire Serial Busk Clock Line.
PCINT23, Pin Change Interrupt source 23: The PC0 pin can serve as an external interrupt
source.
Table 12-10 and Table 12-11 relate the alternate functions of Port C to the overriding signals
shown in Figure 12-5 on page 77.
Table 12-10. Overriding Signals for Alternate Functions in PC7:PC4
Signal
Name
PC7/TOSC2/
PCINT23
PC6/TOSC1/
PCINT22
PC5/TDI/
PCINT21
PC4/TDO/
PCINT20
PUOE AS2 • EXCLK
AS2 JTAGEN JTAGEN
PUOV0 011
DDOE AS2 • EXCLK AS2 JTAGEN JTAGEN
DDOV 0 0 0
SHIFT_IR +
SHIFT_DR
PVOE0 00JTAGEN
PVOV0 00TDO
DIEOE
AS2 • EXCLK
+
PCINT23 • PCIE2
AS2 JTAGEN JTAGEN
DIEOV 0 EXCLK 0 0
DI PCINT23 INPUT PCINT22 INPUT PCINT21 INPUT PCINT20 INPUT
AIO T/C2 OSC OUTPUT
T/C2 OSC
INPUT
TDI INPUT –