Datasheet

MSP430F21x2
SLAS578J –NOVEMBER 2007– REVISED JANUARY 2012 www.ti.com
Table 2. Terminal Functions (continued)
TERMINAL
NO.
I/O DESCRIPTION
NAME
RHB,
PW
RTV
General-purpose digital I/O pin
Timer0_A3, compare: Out2 Output
P2.4/TA0.2/A4/V
REF+
/Ve
REF+
/CA1 20 19 I/O
ADC10 analog input A4 / positive reference
Comparator_A+ input
Input terminal of crystal oscillator
XIN/P2.6/CA6 6 3 I/O General-purpose digital I/O pin
Comparator_A+ input
Output terminal of crystal oscillator
XOUT/P2.7/CA7 5 2 I/O General-purpose digital I/O pin
Comparator_A+ input
General-purpose digital I/O pin
P3.0/UCB0STE/UCA0CLK/A5 11 9 I/O USCI_B0 slave transmit enable/USCI_A0 clock input/output
ADC10 analog input A5
General-purpose digital I/O pin
P3.1/UCB0SIMO/UCB0SDA 12 10 I/O
USCI_B0 slave in/master out in SPI mode, SDA I2C data in I2C mode
General-purpose digital I/O pin
P3.2/UCB0SOMI/UCB0SCL 13 11 I/O
USCI_B0 slave out/master in in SPI mode, SCL I2C clock in I2C mode
General-purpose digital I/O
P3.3/UCB0CLK/UCA0STE 14 12 I/O
USCI_B0 clock input/output, USCI_A0 slave transmit enable
General-purpose digital I/O pin
P3.4/UCA0TXD/UCA0SIMO 15 13 I/O
USCI_A0 transmit data output in UART mode, slave data in/master out
in SPI mode
General-purpose digital I/O pin
P3.5/UCA0RXD/UCA0SOMI 16 14 I/O
USCI_A0 receive data input in UART mode, slave data out/master in in
SPI mode
General-purpose digital I/O pin
P3.6/TA1.0/A6 17 15 I/O Timer1_A2, capture: CCI0B input, compare: Out0 Output
ADC10 analog input A6
General-purpose digital I/O pin
P3.7/TA1.1/A7 18 16 I/O Timer1_A2, capture: CCI1A input, compare: Out1 Output
ADC10 analog input A7
Reset or nonmaskable interrupt input
RST/NMI/SBWTDIO 7 5 I
Spy-Bi-Wire test data input/output during programming and test
Selects test mode for JTAG pins on Port 1. The device protection fuse is
TEST/SBWTCK 1 29 I
connected to TEST.
General-purpose digital I/O pin
P2.5/R
OSC
/CA5 3 32 I/O Input for external resistor defining the DCO nominal frequency
Comparator_A+ input
DV
CC
2 30 Digital supply voltage
DV
SS
4 1 Digital supply voltage
4, 17, 20,
NC NA Not connected internally. Connection to V
SS
is recommended.
31
QFN package pad (RHB, RTV packages). Connection to DV
SS
is
QFN Pad NA Pad
recommended.
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