3
3621A–MICRO–6/06
AT89LP216 [Preliminary]
3. Pin Description
Table 3-1. AT89LP216 Pin Description
Pin Symbol Type Description
1P1.5
I/O
I/O
I
P1.5: User-configurable I/O Port 1 bit 5.
MOSI: SPI master-out/slave-in. When configured as master, this pin is an output. When configured as slave, this pin
is an input.
GPI5: General-purpose Interrupt input 5.
2P1.7
I/O
I/O
I
P1.7: User-configurable I/O Port 1 bit 7.
SCK: SPI Clock. When configured as master, this pin is an output. When configured as slave, this pin is an input.
GPI7: General-purpose Interrupt input 7.
3P1.3
I/O
I
I
I
P1.3: User-configurable I/O Port 1 bit 3 (if Reset Fuse is disabled).
RST
: External Active-Low Reset input (if Reset Fuse is enabled. See “External Reset” on page 14.).
GPI3: General-purpose Interrupt input 3.
DCL: Serial Clock input for On-Chip Debug Interface when OCD is enabled.
4 GND I Ground
5P1.2
I/O
I
P1.2: User-configurable I/O Port 1 bit 2.
GPI2: General-purpose Interrupt input 2.
6P3.0
I/O
I
P3.0: User-configurable I/O Port 3 bit 0.
RXD: Serial Port Receiver Input.
7P3.4
I/O
I/O
P3.4: User-configurable I/O Port 3 bit 4.
T0: Timer/Counter 0 External Input or PWM Output.
8P3.2
I/O
I
I/O
P3.2: User-configurable I/O Port 3 bit 2.
XTAL1: Input to the inverting oscillator amplifier and internal clock generation circuits. It may be used as a port pin if
the internal RC oscillator is selected as the clock source.
DDA: Serial Data input/output for On-Chip Debug Interface when OCD is enabled and the internal RC oscillator is
selected as the clock source.
9P3.3
I/O
O
O
I/O
P3.3: User-configurable I/O Port 3 bit 3.
XTAL2: Output from inverting oscillator amplifier. It may be used as a port pin if the internal RC oscillator is selected
as the clock source.
CLKOUT: When the internal RC oscillator is selected as the clock source, may be used to output the internal clock
divided by 2.
DDA: Serial Data input/output for On-Chip Debug Interface when OCD is enabled and the external clock is selected
as the clock source.
10 P3.5
I/O
I/O
P3.5: User-configurable I/O Port 3 bit 5.
T1: Timer/Counter 1 External input or PWM output.
11 P3.1
I/O
O
P3.1: User-configurable I/O Port 3 bit 1.
TXD: Serial Port Transmitter Output.
12 VDD I Supply Voltage
13 P1.0
I/O
I
I
P1.0: User-configurable I/O Port 1 bit 0.
AIN0: Analog Comparator Positive input.
GPI0: General-purpose Interrupt input 0.
14 P1.1
I/O
I
I
P1.1: User-configurable I/O Port 1 bit 1.
AIN1: Analog Comparator Negative input.
GPI1: General-purpose Interrupt input 1
15 P1.4
I/O
I
I
P1.4: User-configurable I/O Port 1 bit 4.
SS
: SPI slave select input.
GPI4: General-purpose Interrupt input 4.
16 P1.6
I/O
I/O
I
P1.6: User-configurable I/O Port 1 bit 6.
MISO: SPI master-in/slave-out. When configured as master, this pin is an input. When configured as slave, this pin is
an output.
GPI6: General-purpose Interrupt input 6.
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