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SyncMOS Technologies International, Inc.

SM894051

8-Bits Micro-controller

With 4KB Flash ROM embedded

Product List

SM894051L25, 25 MHz 4KB internal memory MCU

SM894051C25, 25 MHz 4KB internal memory MCU

SM894051C40, 40 MHz 4KB internal memory MCU

Feature

Working voltage: 3.0V ~ 3.6V For L Version

4.5V ~ 5.5V For C Version

General 8051 family compatible

12 clocks per machine cycle

4 KB internal flash memory

128 bytes internal RAM

Two 16 bits timers/counters

15 programmable I/O lines

Full duplex serial UART channel

Bit operation instruction

Industrial Level

8-bits unsigned division

8-bits unsigned multiply

BCD arithmetic

Direct addressing

Indirect addressing

Two priority level interrupt

Power save modes:

Idle mode

Power down mode (provide H/W wake-up

function)

Code protection function

One watch dog timer (WDT)

On-chip Analog Comparator

Direct LED Drive Output (Default = 1)

General Description

The SM894051 series product is an 8-bits single

chip micro controller with 4KB flash embedded. It

provides hardware features and a powerful

instruction set, necessary to make it a versatile and

cost effective controller for those applications

demand up to 15 I/O pins or need up to 4KB flash

memory either for program or for data or mixed.

To program the flash block, a commercial

programmer is capable to do it.

Ordering Information

SM894051ihhkL

yymmv

i: process identifier {L=3.0V~3.6V,C=4.5V~ 5.5V}

hh: working clock in MHz {25, 40}

k: package type postfix {as below table}

yy: year, mm: month

v: version identifier {, A, B,...}

L: PB free identifier {no text is Non-PB free, “P” is PB free}

Postfix

P

S

Package

20L PDIP

20L SOIC

Pin / Pad

Configuration

Page 2

Dimension

Page 14

Page 15

Taiwan

6F, No.10-2

Li- Hsin 1st

Road ,

Science-based Industrial Park,

Hsinchu, Taiwan 30078

TEL: 886-3-567-1820

886-3-567-1880

FAX: 886-3-567-1891

886-3-567-1894

Specifications subject to change without notice contact your sales representatives for the most recent information.

SM894051 V1.4 09 /2006

1

SyncMOS Technologies International, Inc.

SM894051

8-Bits Micro-controller

With 4KB Flash ROM embedded

Pin Configuration

Figure 1 20L PDIP Package

Figure 2 20L SOIC Package

Specifications subject to change without notice contact your sales representatives for the most recent information.

SM894051 V1.4 09 /2006

2

SyncMOS Technologies International, Inc.

SM894051

8-Bits Micro-controller

With 4KB Flash ROM embedded

Block Diagram

RAM Address Decoder

&

Register

128 bytes

Timer 0

Timer 1

RAM

UART

Interrupt

Buffer

WDT

Stack

Point

Acc

B

PC

Incrementer

RES

Reset

Circuit

TMP1

TMP2

Program

Counter

Timing

Control

Instruction

Register

ALU

DPTR

Program

XTAL2

XTAL1

OSC

PSW

Register

4K

Port 1

Latch

+

-

Analog Comparator

Port 1

Driver & Mux

Port 3

Driver & Mux

Port 3

Latch

bytes

Flash

Memory

P1.0

P1.1

P3.0 ~ p3.5 & p3.7

Specifications subject to change without notice contact your sales representatives for the most recent information.

3

SM894051 V1.4 09 /2006

SyncMOS Technologies International, Inc.

SM894051

8-Bits Micro-controller

With 4KB Flash ROM embedded

Pin Description (20L PDIP / 20L SOIC)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

$F8

$F0

$E8

$E0

$D8

$D0

$C8

$C0

$B8

$B0

$A8

$A0

$98

$90

$88

$80

SCON

0000 0000

P1

1111 1111

TCON

0000 0000

SBUF

xxxx xxxx

LEDENP1

0000 0000

TL1

0000 0000

DPH

0000 0000

LEDENP3

0000 0000

TH1

0000 0000

WDTC

0x0x x000

WDTKEY

0000 0000

IP

0000 0000

P3

1111 1111

IE

0000 0000

SCONF

0xxx xxxx

PSW

0000 0000

ACC

0000 0000

B

0000 0000

Symbol

RST

P3.0/RXD

P3.1/TXD

XTAL2

XTAL1

P3.2/#INT0

P3.3/#INT1

P3.4/T0

P3.5/T1

VSS

P3.7

P1.0/AIN0

P1.1/AIN1

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7

VDD

Active

H

-/L

I/O

i

i/o

o

i

i/o

Names

Reset

bit 0 of port 3 & receive data

bit 1 of port 3 & transmit data

Crystal out

Crystal in

bit 2 of port 3 & low true interrupt 0

bit 3 of port 3 & low true interrupt 1

bit 4 of port 3 & timer 0

bit 5 of port 3 & timer 1

Sink Voltage, Ground

bit 7 of port 3

bit 0 of port 1 & positive 0 of the on chip analog comparator

bit 1 of port 1 & positive 1 of the on chip analog comparator

bit 2 of port 1

bit 3 of port 1

bit 4 of port 1

bit 5 of port 1

bit 6 of port 1

bit 7 of port 1

Drive voltage, +5 Vcc

$FF

$F7

$EF

$E7

$DF

$D7

$CF

$C7

$BF

$B7

$AF

$A7

$9F

$97

$8F

PCON

0000 0000

$87

Special Function Register (SFR) Memory Map

TMOD

0000 0000

SP

0000 0111

TL0

0000 0000

DPL

0000 0000

TH0

0000 0000

(Reserved)

Note: The text of SFRs with bold type characters are Extension Special Function Registers for SM894051

Specifications subject to change without notice contact your sales representatives for the most recent information.

4

SM894051 V1.4 09 /2006

SyncMOS Technologies International, Inc.

Addr

93H

95H

97H

9FH

BFH

SFR

LEDENP1

LEDENP3

WDTKEY

WDTC

SCONF

Reset

00H

0*0**000

0******0

7

LEDEN

P17

LEDEN

P37

WDT

KEY7

WDTE

WDR

6

LEDEN

P16

Unused

WDT

KEY6

Reserve

Unused

5

LEDEN

P15

LEDEN

P35

WDT

KEY5

CLEAR

Unused

4

LEDEN

P14

LEDEN

P34

WDT

KEY4

Unused

3

LEDEN

P13

LEDEN

P33

WDT

KEY3

Unused

2

LEDEN

P12

LEDEN

P32

WDT

KEY2

PS2

Reserve

SM894051

8-Bits Micro-controller

With 4KB Flash ROM embedded

1

LEDEN

P11

LEDEN

P31

WDT

KEY1

PS1

Unused

0

LEDEN

P10

LEDEN

P30

WDT

KEY0

PS0

ALEI

Operating Conditions

Symbol

TA

VCC5

VCC3.3

Fosc 25

Fosc 40

Description

Operating temperature

Supply voltage

Oscillator Frequency

Min.

-40

4.5

3.0

Typ.

25

5.0

3.3

Max.

85

5.5

3.6

25

40

Unit.

℃

V

MHz

Remarks

Ambient temperature under bias

For 3.3V application

For 5.0V application

DC Characteristic

VCC = 5V (±10%), VSS=0V TA= -40

℃

to 85

℃

SYMBOL

VCC

ICC

IID

IPD

VIL1

VIL2

VIH1

VIH2

IIL

ITL

ILI

VOL1

VOL2

VOH1

ISK1

ISK2

ISR1

RRST

CIO

Supply Voltage

Supply current operating

Supply current IDLE Mode

Supply current Power-Down MODE

Input LOW voltage, P1, P3

Input LOW voltage, RES, XTAL1

Input HIGH voltage, P1, P3

Input HIGH voltage, RES, XTAL1

Input current LOW level, P3.0~P3.5, P3.7

Transition current High to Low, P3.0~P3.5,

P3.7

Input leakage current, P1.0~P1.1

Output LOW voltage, P1.2~P1.7, P3.0~P3.5,

P3.7

Output LOW voltage, P1.0~P1.1

Output High voltage, P3.0~P3.5, P3.7

Output High voltage, P1.2~P1.7

Sink Current P1, P3

Sink Current P1, P3 (LEDD Enable)

Source Current P1, P3

Internal RESET pull-down resistor

Pin capacitance

See notes 1

f

CLK

= 12MHz VCC = 5.5V

See note 2

f

CLK

= 12MHz VCC = 5.5V

P1.0 & P1.1 =0V

See note 3；VCC (= 5.5V)

P1.0 & P1.1 =0V

INPUT

-0.5

0

2.0

70%VCC

VIN = 0.45V

VIN = 2.0 V

0.45V < VIN < VCC-0.3V

OUTPUT

IOL = 8mA，VCC=5.0V

IOL = 6.5mA，VCC =5.0V

IOH = -80uA，VCC =5.0V

VCC = 5.0V, VIN = 0.4 V

VCC = 5.0V, VIN = 2.4 V

VIN = 5.0 V

Test freq=1MHz, TA=25℃

2.4

6

20

-150

300

10

PARAMETER

TEST

CONDITIONS

4.5

LIMITS

MIN

5.5

15

5

20

0.8

Vcc+0.5

-50

-650

±10

0.45

MAX

UNIT

V

mA

μA

V

μA

V

mA

uA

kΩ

pF

50

Specifications subject to change without notice contact your sales representatives for the most recent information.

SM894051 V1.4 09 /2006

5

SM894051L25

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