71M6534 datasheet(43/132 Pages) MAXIM | Exceeds IEC 62053/ANSI C12.20 Standards

Part #	71M6534

Description	Exceeds IEC 62053/ANSI C12.20 Standards

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Manufacturer	MAXIM [Maxim Integrated Products]

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43 / 132 page

FDS_6533_6534_004

71M6533/G/H and 71M6534/H Data Sheet

Rev 2

43

On reset or power-up, all DIO pins are inputs until they are configured for the desired direction under

MPU control. The pin function can be configured by the I/O RAM bits LCD_BITMAPn. Setting

LCD_BITMAPn = 1 configures the pin for LCD, setting LCD_BITMAPn = 0 configures it for DIO.

Once a pin is configured as DIO, it can be configured independently as an input or output with the

DIO_DIR bits or the LCD_SEGn registers. Input and output data are written to or read from the pins using

SFR registers P0, P1, and P2.

Table 39 through

Table 42 shows all the DIO pins with their configuration, direction control and data registers. Table

entries marked with an asterisk and grayed are applicable to the 71M6534 only.

Table 39: Data/Direction Registers and Internal Resources for DIO 1-15

DIO

PB

1

2

3

4

5

6

7

8

9

10 11 12* 13 14 15

LCD Segment

–

24 25 26 27 28 29 30 31 32* 33 34 35

71M6533 Pin #

97 91

3

17 60 61 62 63 67 68 69 70

–

44 29 30

71M6534 Pin #

114 109 3 22 70 71 72 73 77 78 79 80 120 50 35 36

Configuration (DIO

or LCD segment)

Always DIO

0

1

2

3

4

5

6

7

0* 1

2

3

LCD_BITMAP[31:24]

LCD_BITMAP[39:32]

Data Register

0

1

2

3

4

5

6

7

0

1

2

3

4*

5

6

7

DIO0 = P0 (SFR 0x80)

DIO1 = P1 (SFR 0x90)

Direction Register

0 = input, 1 = output

–

1

2

3

4

5

6

7

0

1

2

3

4*

5

6

7

DIO_DIR0 (SFR 0xA2)

DIO_DIR1 (SFR 0x91)

Internal Resources

Configurable

Y

–

Table 40: Data/Direction Registers and Internal Resources for DIO 16-30

DIO

16 17 18 19 20 21 22* 23 24 25 26 27 28* 29 30

–

LCD Segment

36 37 38 39 40 41 42* 43 44 45 46 47 48* 49 50

–

71M6533 Pin #

33 12 13 64 65 66

–

54 46 43 42 41

–

32 35

–

71M6534 Pin #

39 17 18 74 75 76 115 64 52 49 48 47 81 38 41

Configuration (DIO

or LCD segment)

4

5

6

7

0

1

2*

3

4

5

6

7

0*

1

2

–

LCD_BITMAP[39:32]

LCD_BITMAP[47:40]

LCD_BITMAP[55:48]

Data Register

0

1

2

3

4

5

6*

7

0

1

2

3

4*

5

6

–

DIO2 = P2 (SFR 0xA0)

DIO3 = P3 (SFR 0xB0)

Direction Register

0 = input, 1 = output

0

1

2

3

4

5

6*

7

DIO_DIR2 (SFR 0xA1)

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