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TE
CH
tm
T81L0003B
TM Technology Inc. reserves the right
P. 1
Publication Date: NOV. 2005
to change products or specifications without notice. Revision:A
8-bit MCU
1. Features
!
Compatible with MCS-51
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Embedded 8K Bytes OTP ROM
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256 x 8-bit Internal RAM
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13 Programmable I/O Lines for 18-pin
Package
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2 16-bit Timer/Counter & 1 16-bit Timer
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2 External Interrupt Input
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Programmable Serial UART Interface
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Low Power Idle & Power-down Modes
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Watch-dog Timer
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On-chip Crystal & RC Oscillator (Selected
by Bonding Option)
!
Internal Power-on Reset and External Reset
Supported
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SOP18/DIP18 Package
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3.3V Operating Voltage
2. General Description
The T81L0003B is 8-bit microcontroller
designed and developed with low power and high
speed CMOS technology. It contains a 8K bytes
OTP ROM, a 256 × 8 RAM, 13 I/O lines, a
watchdog timer, two 16-bit counter/timers, a
seven source, two-priority level nested interrupt
structure, a full duplex UART, and an on-chip
oscillator and clock circuits.
In addition, the T81L0003B has two selectable
modes of power reduction-idle mode and
power-down mode. The idle mode freezes the
CPU while allowing the RAM, timers, serial port,
and interrupt system to continue functioning. The
power-down mode saves the RAM contents but
freezes the oscillator, causing all other chip
functions to be inoperative.