
199
8266A-MCU Wireless-12/09
RXD0, USART0 Receive Pin. Receive Data (Data input pin for the USART0). When the
USART0 receiver is enabled this pin is configured as an input regardless of the value of
DDRE0. When the USART0 forces this pin to be an input, a logical one in PORTE0 will
turn on the internal pull-up.
PCINT8, Pin Change Interrupt source 8: The PE0 pin can serve as an external interrupt
source.
Table 14-10 below and Table 14-11 below relates the alternate functions of Port E to
the overriding signals shown in Figure 14-5 on page 191.
Table 14-10. Overriding Signals for Alternate Functions PE7:PE4
Signal
Name
PE7/INT7/ICP3 PE6/INT6/T3 PE5/INT5/OC3C PE4/INT4/OC3B
PUOE 0 0 0 0
PUOV 0 0 0 0
DDOE 0 0 0 0
DDOV 0 0 0 0
PVOE 0 0 OC3C ENABLE OC3B ENABLE
PVOV 0 0 OC3C OC3B
DIEOE INT7 ENABLE INT6 ENABLE INT5 ENABLE INT4 ENABLE
DIEOV 1 1 1 1
DI INT7 INPUT / ICP3
INPUT
INT7 INPUT / T3
INPUT
INT5 INPUT INT4 INPUT
AIO – – – –
Table 14-11. Overriding Signals for Alternate Functions PE3:PE0
Signal
Name
PE3/AIN1/OC3A PE2/AIN0/XCK0 PE1/TXD0 PE0 /
RXD0/PCINT8
PUOE 0 0 TXEN0 RXEN0
PUOV 0 0 0 PORTE0 & (~PUD)
DDOE 0 XCK0 OUTPUT
ENABLE
TXEN0 RXEN0
DDOV 0 1 1 0
PVOE OC3BENABLE XCK0 OUTPUT
ENABLE
TXEN0 0
PVOV OC3B XCK0 OUTPUT TXD0 0
DIEOE 0 0 0 PCINT8 & PCIE1
DIEOV 0 0 0 1
DI 0 XCK0 INPUT – RXD0
PE0 0 0 0 PCINT8 INPUT
AIO AIN1 INPUT AIN0 INPUT - -
14.3.4 Alternate Functions of Port F
The Port F has an alternate function as analog input for the ADC as shown in Table
14-12 on page 200. If some Port F pins are configured as outputs, it is essential that
these do not switch when a conversion is in progress. This might corrupt the result of
the conversion. If the JTAG interface is enabled, the pull-up resistors on pins PF7(TDI),
PF5(TMS), and PF4(TCK) will be activated even if a Reset occurs.
Komentarze do niniejszej Instrukcji