Flash Programmable 12-Bit Integrated

Data-Acquisition Systems

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15

Pin Description (continued)

PIN

NAME

FUNCTION

P3.1: Bit 1 for General Purpose I/O Port 3

25

P3.1/

TXD0

TXD0: Transmit Serial Output for Serial Port

P3.0: Bit 0 for General Purpose I/O Port 3 (least significant bit)

26

P3.0/

RXD0

RXD0: Receive Serial Input for Serial Port

27

DGND

Digital Ground. Connect DGND to AGND at the power source. Connect pins 27, 39, and 61 together.

28

Positive Digital Supply Voltage. Bypass with a 0.1µF in parallel with a 10µF low ESR capacitor to DGND.

Connect pins 28, 40, and 62 together.

P2.0: Bit 0 for General Purpose I/O Port 2 (least significant bit)

29

P2.0/A8

A8: Bit 8 for Internal Flash Memory Address

P2.1: Bit 1 for General Purpose I/O Port 2

30

P2.1/A9

A9: Bit 9 for Internal Flash Memory Address

P2.2: Bit 2 for General Purpose I/O Port 2

31

P2.2/A10

A10: Bit 10 for Internal Flash Memory Address

P2.3: Bit 3 for General Purpose I/O Port 2

32

P2.3/A11

A11: Bit 11 for Internal Flash Memory Address

P2.4: Bit 4 for General Purpose I/O Port 2

33

P2.4/A12

A12: Bit 12 for Internal Flash Memory Address

P2.5: Bit 5 for General Purpose I/O Port 2

34

P2.5

Upper and Lower Internal Flash Memory Select (see Table 2)

P2.6: Bit 6 for General Purpose I/O Port 2

35

P2.6

Flash Programming Mode Select (see Table 2)

P2.7: Bit 7 for General Purpose I/O Port 2 (most significant bit)

36

P2.7

Flash Programming Mode Select (see Table 2)

37

PSEN

Program Store Enable (active-low). Qualifies program read from external devices. To ensure flash data

Ω.

than or equal to 200k

Ω.

38

ALE/

PROG

PROG: Flash Memory Program Pulse

39

DGND

Digital Ground. Connect pins 27, 39, and 61 together.

40

Positive Digital Supply Voltage. Bypass with a 0.1µF in parallel with a 10µF low ESR capacitor to DGND.

Connect pins 28, 40 and 62 together.

P0.0: Bit 0 for General Purpose I/O Port 0 (least significant bit)

41

P0.0/AD0

AD0: Bit 0 for Internal Flash Memory Data or External Memory I/O Data (least significant bit)

P0.1: Bit 1 for General Purpose I/O Port 0

42

P0.1/AD1

AD1: Bit 1 for Internal Flash Memory Data or External Memory I/O Data

P0.2: Bit 2 for General Purpose I/O Port 0

43

P0.2/AD2

AD2: Bit 2 for Internal Flash Memory Data or External Memory I/O Data

P0.3: Bit 3 for General Purpose I/O Port 0

44

P0.3/AD3

AD3: Bit 3 for Internal Flash Memory Data or External Memory I/O Data

P0.4: Bit 4 for General Purpose I/O Port 0

45

P0.4/AD4

AD4: Bit 4 for Internal Flash Memory Data or External Memory I/O Data