71M6543HT datasheet(16/75 Pages) MAXIM

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Pin Descriptions (continued)

NAME

TYPE CIRCUIT

FUNCTION

100

DIGITAL PINS

12–15

COM0–COM3

LCD Common Outputs. These four pins provide the select signals for the

LCD display.

SEGDIO0/WPULSE

I/O

3, 4, 5

Multiple-UsePins.ConfigurableaseitherLCDsegmentdriverorDIO.

Alternative functions with proper selection of associated I/O RAM registers

are:

SEGDIO0 = WPULSE

SEGDIO1 = VPULSE

SEGDIO2 = SDCK

SEGDIO3 = SDATA

SEGDIO6 = XPULSE

SEGDIO7 = YPULSE

SEGDIO8 = DI

SEGDIO16 = RX3

SEGDIO17 = TX3

UnusedpinsmustbeconfiguredasoutputsorterminatedtoV3P3/GNDD.

SEGDIO1/VPULSE

SEGDIO2/SDCK

SEGDIO3/SDATA

SEGDIO4

SEGDIO5

SEGDIO6/XPULSE

SEGDIO7/YPULSE

SEGDIO8/DI

35–30

SEGDIO[9:14]

29–27

SEGDIO[15:17]

SEGDIO[18]

24–18

SEGDIO[19:25]

11–4

SEGDIO[28:35]

95–94

SEGDIO[44:45]

99–96

SEGDIO[40:43]

SEGDIO52

SEGDIO53

SEGDIO54

SEGDIO26/COM5

I/O

3, 4, 5

Multiple-UsePins.ConfigurableaseitherLCDsegmentdriverorDIOwith

alternative function (LCD common drivers).

SEGDIO27/COM4

SPI_CSZ/SEGDIO36

I/O

3, 4, 5

Multiple-UsePins.ConfigurableaseitherLCDsegmentdriverorDIOwith

alternative function (SPI interface).

SPI_DO/SEGDIO37

SPI_DI/SEGDIO38

100

SPI_CKI/SEGDIO39

OPT_TX/SEGDIO51

I/O

3, 4, 5

Multiple-UsePins,configurableaseitherLCDsegmentdriverorDIOwith

alternative function (optical port/UART1)

OPT_RX/SEGDIO55

E_RXTX/SEG48

I/O

1, 4, 5

MultiusePins.Configurableaseitheremulatorportpins(whenICE_E

pulled high) or LCD segment drivers (when ICE_E tied to GND).

E_RST/SEG50

E_TCLK/SEG49

4, 5

ICE_E

ICE Enable. When zero, E_RST, E_TCLK, and E_RXTX become SEG50,

SEG49, and SEG48, respectively. For production units, this pin should be

pulled to GND to disable the emulator port.

TMUXOUT/SEG47

4, 5

Multiple-UsePins.Configurableaseithermultiplexer/clockoutputorLCD

segment driver using the I/O RAM registers.

TMUX2OUT/SEG46

RESET

Chip Reset. This input pin is used to reset the chip into a known state. For

normal operation, this pin is pulled low. To reset the chip, this pin should

be pulled high. This pin has an internal 30FA (nominal) current source

pulldown. No external reset circuitry is necessary.

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