SyncMOS Technologies International, Inc.
SM89T16R1
8-Bits Micro-controller
With 64KB Flash ROM & 1KB RAM & Two UART & RTC & ADC & PWM embedded
Dual DPTR Function
The DPS.0 define the instruction of INC DPTR AND DEC DPTR are working in DPTR0 or DPTR1.
DPS ($A6H)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
DPS
DPS = 1 the instruction of INC DPTR and DEC DPTR are working in DPTR1.
= 0 the instruction of INC DPTR and DEC DPTR are working in DPTR0.
DPH ($83H)
Bit7
Bit6
Bit6
Bit6
Bit6
Bit5
Bit5
Bit5
Bit5
Bit4
Bit4
Bit4
Bit4
Bit3
Bit3
Bit3
Bit3
Bit2
Bit2
Bit2
Bit2
Bit1
Bit1
Bit1
Bit1
Bit0
Bit0
Bit0
Bit0
DPL ($82H)
Bit7
DPH1 ($A5H)
Bit7
DPL1 ($A4H)
Bit7
Data SRAM
The SCONF.1 must set to ‘1’ to enable the Expand 1024 bytes RAM, and this Expand RAM area must read/write by
using the MOVX instruction.
SCONF ($BFH)
Bit7
Bit6
Bit5
Bit4
PDWUE
Bit3
Bit2
Bit1
OME
Bit0
ALEI
SMOD_1
SMOD_1: This bit set to ‘1’ to make the serial port 1 baud-rate double.
PDWUE: When set to ‘1’, enable the PDWU function.
OME: When set to ‘1’, enable the 1024 bytes expanded RAM.
ALEI: When set to ‘1’, it will stop ALE clock output for EMI reduce.
Power Management Mode (PMM)
Power Management Mode offers a complete scheme of reduced internal clock speeds that allow the CPU to run
software but to use substantially less power. Normally, during default operation, the SM89T16R1 uses 4 clocks per
machine cycle. Thus the instruction cycle (machine cycle clock) rate is clock/4. At 16 MHz crystal speed, the
instruction cycle speed is 4 MHz. In Power Management Mode (PMM) the instruction cycle (machine cycle clock)
rate is clock/1024. At same 16 MHz crystal speed, the instruction cycle speed is 15.6 KHz. The operation current is
down from 20mA to 5mA. See Table 5.
Table 5
Full Operation (4 clocks/machine cycle)
Instruction rate/operation current
2.765 MHz/19.6 mA
PMM (1024 clocks/machine cycle)
Instruction rate/operation current
10.8 KHz/4.78 mA
Crystal Speed
11.0592 MHz
16 MHz
4.0 MHz/20 mA
6.25 MHz/30 mA
15.6 kHZ/5 mA
25 MHz
24.4 kHz/5.6 mA
Specifications subject to change without notice contact your sales representatives for the most recent information.
Ver 2.1 SM89T16R1 08/2006
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SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
