ATmega64A datasheet(263/392 Pages) ATMEL

tên linh kiện	ATmega64A

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 64K Bytes In-System Programmable Flash

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263

8160C–AVR–07/09

ATmega64A

The Boundary-scan logic is not included in the figures in this Datasheet. Figure 25-4 shows a

simple digital Port Pin as described in the section “I/O Ports” on page 68. The Boundary-scan

details from Figure 25-3 replaces the dashed box in Figure 25-4.

When no alternate port function is present, the Input Data – ID corresponds to the PINxn Regis-

ter value (but ID has no synchronizer), Output Data corresponds to the PORT Register, Output

Control corresponds to the Data Direction – DD Register, and the Pull-up Enable – PUExn – cor-

responds to logic expression PUD · DDxn · PORTxn.

Digital alternate port functions are connected outside the dotted box in Figure 25-4 to make the

scan chain read the actual pin value. For analog function, there is a direct connection from the

external pin to the analog circuit, and a scan chain is inserted on the interface between the digi-

tal logic and the analog circuitry.

Figure 25-3. Boundary-scan Cell for Bi-directional Port Pin with Pull-up Function

Vcc

EXTEST

To Next Cell

ShiftDR

From Last Cell

UpdateDR

ClockDR

FF2

LD2

FF1

LD1

LD0

FF0

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