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Function
Signal
Name
ADCCLK
nADCCS
ADC
ADCOUT
Interface
(SSI1)
ADCIN
SMPCLK
LEDDRV
PHDIN
TXD[1-2]
IrDA and
RXD[1-2]
RS232
DSR
Interfaces
DCD
CTS
DD[0-3]
CL[1]
CL[2]
LCD
FRM
M
COL[0-7]
Keyboard &
BUZ
Buzzer drive
PD[0]/
LED Flasher
LEDFLSH
64
Signal
O
Serial clock output
O
Chip select for ADC interface
O
Serial data output
I
Serial data input
O
Sample clock output
O
Infrared LED drive output (UART1)
I
Photo diode input (UART1)
O
RS232 UART1 and 2 TX outputs
I
RS232 UART1 and 2 RX inputs
I
RS232 DSR input
I
RS232 DCD input
I
RS232 CTS input
I/O
LCD serial display data; pins can be used on power up to read the ID
of some LCD modules (See Table 31 on page 66).
O
LCD line clock
O
LCD pixel clock
O
LCD frame synchronization pulse output
O
LCD AC bias drive
O
Keyboard column drives (SYSCON1)
O
Buzzer drive output (SYSCON1)
O
LED flasher driver — multiplexed with Port D bit 0. This pin can pro-
vide up to 4 mA of drive current.
Table 29. External Signal Functions (cont.)
Description
DS508UM1
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