t81l0003a TM Technology Inc., t81l0003a Datasheet - Page 5

• Manufacturer Part Number: t81l0003a
• Description: Reduced I/o 8-bit Mcu
• Manufacturer: TM Technology Inc.

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Pin Description
VDD
GND
Port 1
inputs. When port 1 pins are written as 1’s, these pins are pulled high by the internal pull-ups and can be used as inputs. As
inputs, Port 1 pins that are externally being pulled low will source current (I
receives the low-order address bytes during OTP programming and verification.
general I/O.
Port 3
inputs. When port 0 pins are written as 1’s, these pins are pulled high by the internal pullups and can be used as inputs. As
inputs, Port 3 pins that are externally being pulled low will source current (I
RST
running resets the device.
XIN
XOUT
TM Technology, Inc. reserves the right
to change products or specifications without notice.
3.3V Supply voltage.
Ground.
Port 1 is an 8-bit bi-directional I/O port with internal pull-ups. The Port 1 output buffers can sink/source four TTL
P1.0 serves as functions of Buzz used driving buzzer, because this pin design for more driving capability than other
Port 3 is an 8-bit bi-directional I/O port with internal pull-ups. The Port 3 output buffers can sink/source four TTL
Port 3 also serves the functions of various special features of the T81L0001A as listed below:
Alternate Function:
P3.0:
P3.1:
P3.2:
P3.3:
P3.4:
Reset input and active high. When high on this pin should be lasting for two machine cycles while the oscillator is
Input to the inverting oscillator amplifier and input to the internal clock operating circuit in BK,BD parts.
Output from the inverting oscillator amplifier in BK,BD part.
CH
TE
RXD
TXD
INT0
INT1
T0
P. 5
IL
IL
) because of the pullups.
) because of the internal pull-ups. Port 1 also
Publication Date: SEP. 2004
T81L0003A
Revision: C