SyncMOS Technologies International, Inc.

SM894051

8-Bits Micro-controller

With 4KB Flash ROM embedded

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

SM894051

V1.4

09 /2006

Pin Description (20L PDIP / 20L SOIC)

Pin

Symbol

Active

I/O

Names

1

RST

H

i

Reset

2

P3.0/RXD

i/o

bit 0 of port 3 & receive data

3

P3.1/TXD

i/o

bit 1 of port 3 & transmit data

4

XTAL2

o

Crystal out

5

XTAL1

i

Crystal in

6

P3.2/#INT0

-/L

i/o

bit 2 of port 3 & low true interrupt 0

7

P3.3/#INT1

-/L

i/o

bit 3 of port 3 & low true interrupt 1

8

P3.4/T0

i/o

bit 4 of port 3 & timer 0

9

P3.5/T1

i/o

bit 5 of port 3 & timer 1

10

VSS

Sink Voltage, Ground

11

P3.7

i/o

bit 7 of port 3

12

P1.0/AIN0

i/o

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

13

P1.1/AIN1

i/o

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

14

P1.2

i/o

bit 2 of port 1

15

P1.3

i/o

bit 3 of port 1

16

P1.4

i/o

bit 4 of port 1

17

P1.5

i/o

bit 5 of port 1

18

P1.6

i/o

bit 6 of port 1

19

P1.7

i/o

bit 7 of port 1

20

VDD

Drive voltage, +5 Vcc

Special Function Register (SFR) Memory Map

$F8

$FF

$F0

B

0000 0000

$F7

$E8

$EF

$E0

ACC

0000 0000

$E7

$D8

$DF

$D0

PSW

0000 0000

$D7

$C8

$CF

$C0

$C7

$B8

IP

0000 0000

SCONF

0xxx xxxx

$BF

$B0

P3

1111 1111

$B7

$A8

IE

0000 0000

$AF

$A0

$A7

$98

SCON

0000 0000

SBUF

xxxx xxxx

WDTC

0x0x x000

$9F

$90

P1

1111 1111

LEDENP1

0000 0000

LEDENP3

0000 0000

WDTKEY

0000 0000

$97

$88

TCON

0000 0000

TMOD

0000 0000

TL0

0000 0000

TL1

0000 0000

TH0

0000 0000

TH1

0000 0000

$8F

$80

SP

0000 0111

DPL

0000 0000

DPH

0000 0000

(Reserved)

PCON

0000 0000

$87

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

4