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ATMEGA640 Datasheet(PDF) 84 Page - Microchip Technology

Part # ATMEGA640
Description  8-bit Microcontroller with 16/32/64KB In-System Programmable Flash
PDF  436 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATMEGA640 Datasheet(HTML) 84 Page - Microchip Technology

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84
ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]
DS40002211A
• PDI/RXD0/PCINT8 – Port E, Bit 0
PDI, SPI Serial Programming Data Input. During Serial Program Downloading, this pin is used as data input line for
the ATmega1281/2561. For ATmega640/1280/2560 this function is placed on MOSI.
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 13-16 on page 84 and Table 13-17 on page 84 relates the alternate functions of Port E to the overriding sig-
nals shown in Figure 13-5 on page 73.
Note:
1. PDO/PDI only available at PE1/PE0 for ATmega1281/2561.
Table 13-16. 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 13-17. Overriding Signals for Alternate Functions in PE3:PE0
Signal Name
PE3/AIN1/OC3A
PE2/AIN0/XCK0
PE1/PDO(1)/TXD0
PE0/PDI(1)/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
OC3B ENABLE
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
–
–



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