SyncMOS Technologies International, Inc.
SM89T16R1
8-Bits Micro-controller
With 64KB Flash ROM & 1KB RAM & Two UART & RTC & ADC & PWM embedded
UART (Synchronous Mode)
SM2=0 => TXD Clock =XTAL/12
ALE
/PSEN
WRITE_TO_SBUF
TXD_DATA_OUT
TXD_CLOCK
D0
D1
D6
D7
TI
WRITE_TO_SCON_TO_CLEAN_RI
RXD_DATA_IN
TXD_CLOCK
RI
D0
D1
D6
D7
Figure 11 UART Mode 0 Timing
Function Description
The SM89T16R1 is a High-Speed (4 clocks/machine cycle) stand-alone high-performance microcontroller designed
for use in 3V/5V application, such as LCD monitor, instrumentation, or high-end consumer applications.
In addition to the 80C51 standard functions, the device provides a number of dedicated hardware functions for these
applications.
The SM89T16R1 is a control-oriented CPU with on-chip program and data memory. It can be extended with external
data memory up to 64K bytes. For system requiring extra capability, the SM89T16R1 can be enhanced by using
external memory and peripherals.
The SM89T16R1 has two software selectable modes of saving power consumption-IDLE and POWER-DOWN. The
IDLE mode freezes the CPU while allowing the RAM, timer, serial ports and interrupt system to continue functioning.
The POWER-DOWN mode save the RAM contents but freezes the oscillator causing all other chip functions to be
inoperative. The POWER-DOWN mode can be terminated by H/W reset, or by any one of the six external interrupt or
RTC function.
CPU
The CPU of SM89T16R1 is High-Speed 80C51. The structure of this CPU is shown as FIGURE 12. It contains
Instruction Register (IR), Instruction Decoder, Program Counter (PC), Accumulator (ACC), B Register, and control
logic. This CPU provides an 8-bits bi-direction bus to communicate with other blocks in the chip. The address and
data are transferred through on the same 8-bits bus.
Specifications subject to change without notice contact your sales representatives for the most recent information.
Ver 2.1 SM89T16R1 08/2006
13
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
