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ATMEGA640 Datasheet(PDF) 299 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) 299 Page - Microchip Technology

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]
DS40002211A
When JTAG IR contains EXTEST or SAMPLE_PRELOAD the clock is not sent out on the port pins even if the
CKOUT fuse is programmed. Even though the clock is output when the JTAG IR contains SAMPLE_PRELOAD,
the clock is not sampled by the boundary scan.
Figure 28-3. Boundary-scan Cell for Bi-directional Port Pin with Pull-up Function.
DQ
DQ
G
0
1
0
1
DQ
DQ
G
0
1
0
1
0
1
Vcc
EXTEST
To Next Cell
ShiftDR
Output Control (OC)
Output Data (OD)
Input Data (ID)
From Last Cell
UpdateDR
ClockDR
FF1
LD1
LD0
FF0
0
1
Pull-up Enable (PUE)



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