
TE
CH
tm
T81L0010A
TM Technology Inc. reserves the right 
P. 1               
Publication Date: SEP. 2005 
to change products or specifications without notice.                                  Revision:A
8-bit MCU 
1. Features 
! 
Compatible with MCS-51 
! 
Embedded 8K Bytes OTP ROM 
! 
256 x 8-bit Internal RAM 
! 
15 Programmable I/O Lines for 20-pin 
Package 
! 
2 16-bit Timer/Counter & 1 16-bit Timer 
! 
2 External Interrupt Input  
! 
Programmable Serial UART Interface 
! 
Low Power Idle & Power-down Modes 
! 
Watch-dog Timer 
! 
On-chip Crystal & RC Oscillator (Selected 
by Bonding Option) 
! 
Internal Power-on Reset and External Reset 
Supported 
! 
SOP20/DIP20 Package
! 
3.3V Operating Voltage 
2. General Description 
The T81L0010A 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, 15 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 T81L0010A 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. 
3. Order Information 
Part number 
Oscillator type 
T81L0010A-AK 
RC 
T81L0010A-BK 
Crystal 
T81L0010A-AD 
RC 
T81L0010A-BD 
Crystal 
Package 
20-pin DIP 
20-pin DIP 
20-pin SOP 
20-pin SOP