
Pin Description
M30240 Group
Rev.1.00 Sep 24, 2003 Page 7 of 360
1.1.6 Pin Description
Table 1.3:
Figure pin description
Pin #
Name
I/O
Description
1
P87
I/O
CMOS I/O port. This pin also functions as an external trigger for A-D conversion.
2
P86
I/O
CMOS I/O port. This pin also functions as the start of frame (SOF) pulse for the
USB module.
3
P85/(NMI)
I
CMOS input port. This pin also functions as a non-maskable external interrupt.
4,5
P84 ~ P83
I/O
CMOS I/O port. P84 also functions as external interrupt 1 and P83 is used to
enable the stealth detach function for the USB transceiver.
6EXTCAP
_
An external capacitor (Ext. Cap) pin. When the USB transceiver voltage
converter is used, a 2.2
F and a 0.1 F capacitor should connect between this
pin and Vss to ensure proper operation of the USB line driver. This option is
enabled by setting bit 4 of the USB control register (000C16) to a “1”.
7
BYTE
I
Connect this pin to Vss
8
CNVss
I
Connect this pin to Vss
9
USB D+
I/O
USB D+ voltage line interface, a series resistor of 27 to 33
is connected to this
pin.
10
USB D-
I/O
USB D- voltage line interface, a series resistor of 27 to 33
is connected to this
pin.
11
RESET
I
A “L” on this input resets the microcomputer.
12
XOUT
OSee Xin
13
Vss
-
Ground: Vss = 0V
14
Xin
I
Input and output signals to and from the internal clock generation circuit.
Connect a ceramic resonator or quartz crystal between Xin and Xout pins to set
the oscillation frequency. If an external clock is used, connect the clock source
to the Xin pin and leave the Xout pin open.
15
Vcc
-
Power: Vcc = 4.1~ 5.25V
16
P82
I/O
CMOS I/O port. This pin also functions as external interrupt 0.
17-18
P81 ~ P80
I/O
CMOS I/O port. Pins in this port also function as TimerA4 input and output as
selected by software.
19-22
P77 ~ P74
I/O
CMOS I/O port. Pins in this port also function as timer pins.
P77 and P76 can function as TimerA3 input and output as selected by software.
P75 and P74 can function as TimerA2 input and output as selected by software.
23-26
P73 ~ P70
I/O
CMOS I/O port. Pins in this port also function as UART2 CTS, RTS, CLK, RXD,
and TXD as selected by software.
P73 and P72 can function as TimerA1 input and output as selected by software.
P71 and P70 can function as TimerA0 input and output as selected by software.
27-30
P67 ~ P64
I/O
CMOS I/O port. Pins in this port also function as UART1 CTS, RTS, CLK, Serial
Clock, RXD, and TXD as selected by software. TXD(OE~) and RTS(SUSPEND)
in addition to D+ and D- can be used to run the device in USB bypass mode.
31-34
P63 ~ P60
I/O
CMOS I/O port. Pins in this port also function as UART0 CTS, RTS, CLK, RXD,
and TXD as selected by software.
35-42
P37 ~ P30
I/O
CMOS I/O port.