Datasheet

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SBAS203J − MARCH 2002 − REVISED JANUARY 2008
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13
PIN DESCRIPTIONS
PIN # NAME DESCRIPTION
1 XOUT The crystal oscillator pin XOUT supports parallel resonant AT cut fundamental frequency crystals and ceramic
resonators. XOUT serves as the output of the crystal amplifier.
2 XIN The crystal oscillator pin XIN supports parallel resonant AT cut fundamental frequency crystals and ceramic
resonators. XIN can also be an input if there is an external clock source instead of a crystal.
3−10 P3.0–P3.7 Port 3 is a bidirectional I/O port. The alternate functions for Port 3 are listed below.
3−10
P3.0–P3.7
PORT 3.x Alternate Name(s) Alternate Use
P3.0 RxD0 Serial port 0 input
P3.1 TxD0 Serial port 0 output
P3.2 INT0 External interrupt 0
P3.3 INT1/TONE/PWM External interrupt 1/TONE/PWM output
P3.4 T0 Timer 0 external input
P3.5 T1 Timer 1 external input
P3.6 WR External data memory write strobe
P3.7 RD External data memory read strobe
11, 14, 15, 42, 58 DV
DD
Digital power supply
12, 41, 57 DGND Digital ground
13 RST A HIGH on the reset input for two t
OSC
periods resets the device.
16, 32, 33 NC No connection. This pin must be left unconnected.
17, 27 AGND Analog ground
18 AIN0 Analog input channel 0
19 AIN1 Analog input channel 1
20 AIN2 Analog input channel 2
21 AIN3 Analog input channel 3
22 AIN4 Analog input channel 4
23 AIN5 Analog input channel 5
24 AIN6, EXTD Analog input channel 6, digital low-voltage detect input, generates DLVD interrupt
25 AIN7, EXTA Analog input channel 7, analog low-voltage detect input, generates ALVD interrupt
26 AINCOM Analog common for single-ended inputs or analog input for differential inputs
28 AV
DD
Analog power supply. AV
DD
must rise above 2.0V to disable Analog Brownout Reset function.
29 REF IN– Voltage reference negative input (must be tied to AGND for internal V
REF
)
30 REF IN+ Voltage reference positive input
31 REF OUT Internal voltage reference output (tie to REF IN+ for internal V
REF
use)
34−40, 43 P2.0−P2.7 Port 2 is a bidirectional I/O port. The alternate functions for Port 2 are listed below. Refer to P2DDR, SFR B1h−B2h.
34−40, 43
P2.0−P2.7
PORT 2.x Alternate Name Alternate Use
P2.0 A8 Address bit 8
P2.1 A9 Address bit 9
P2.2 A10 Address bit 10
P2.3 A11 Address bit 11
P2.4 A12 Address bit 12
P2.5 A13 Address bit 13
P2.6 A14 Address bit 14
P2.7 A15 Address bit 15