SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
Product List
Feature
SM894051L25, 25 MHz 4KB internal memory MCU
SM894051C25, 25 MHz 4KB internal memory MCU
z
4.5V ~ 5.5V For C Version
z
z
z
z
z
z
z
z
z
z
z
z
z
z
z
z
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}
k: package type postfix {as below table}
yy: year,
mm: month
v: version identifier {, A, B,...}
z
z
z
z
L: PB free identifier {no text is Non-PB free, “P” is PB free}
Postfix
P
S
Package
20L PDIP
20L SOP
Working voltage: 3.0V ~ 3.6V For L 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)
Taiwan
6F, No.10-2 Li- Hsin 1st Road ,
Science-based Industrial Park,
Hsinchu, Taiwan 30078
Pin / Pad Configuration
Page 2
Page 2
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.
ISSFD-M026
1
Ver:C SM894051 10 /2009
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
Pin Configuration
1
20
VDD
RXD/P3.0
2
19
P1.7
TXD/P3.1
3
18
P1.6
XTAL2
4
17
P1.5
XTAL1
5
16
P1.4
INT0/P3.2
6
15
P1.3
INT1/P3.3
7
14
P1.2
T0/P3.4
8
13
P1.1/AIN1
T1/P3.5
9
12
P1.0/AIN0
VSS
10
11
P3.7
RESET
1
20
VDD
RXD/P3.0
2
19
P1.7
TXD/P3.1
3
18
P1.6
XTAL2
4
17
P1.5
XTAL1
5
16
P1.4
INT0/P3.2
6
15
P1.3
INT1/P3.3
7
14
P1.2
T0/P3.4
8
13
P1.1/AIN1
T1/P3.5
9
12
P1.0/AIN0
VSS
10
11
P3.7
(20L PDIP Top View)
RESET
(20L SOP Top View)
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M026
2
Ver:C SM894051 10 /2009
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
Block Diagram
RAM Address Decoder
&
Register
128 bytes
Timer 0
RAM
Timer 1
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
PSW
Register
OSC
4K
Port 3
Latch
Port 1
Latch
bytes
Flash
+
Memory
Analog Comparator
Port 3
Driver & Mux
Port 1
Driver & Mux
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.
ISSFD-M026
3
Ver:C SM894051 10 /2009
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
Pin Description (20L PDIP / 20L SOIC)
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
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
-/L
I/O
i
i/o
i/o
o
i
i/o
i/o
i/o
i/o
i/o
i/o
i/o
i/o
i/o
i/o
i/o
i/o
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
Special Function Register (SFR) Memory Map
$F8
$F0
$FF
B
0000 0000
$F7
$E8
$E0
$EF
ACC
0000 0000
$E7
$D8
$D0
$DF
PSW
0000 0000
$D7
$C8
$CF
$C0
$C7
$B8
$B0
$A8
IP
0000 0000
P3
1111 1111
IE
0000 0000
SCONF
0xxx xxxx
$B7
$AF
$A0
$98
$90
$88
$BF
$A7
SCON
0000 0000
P1
1111 1111
TCON
0000 0000
$80
SBUF
xxxx xxxx
TMOD
0000 0000
SP
0000 0111
TL0
0000 0000
DPL
0000 0000
LEDENP1
1111 1111
TL1
0000 0000
DPH
0000 0000
TH0
0000 0000
(Reserved)
WDTC
0x0x x000
WDTKEY
0000 0000
LEDENP3
1111 1111
TH1
0000 0000
PCON
0000 0000
Note: The text of SFRs with bold type characters are Extension Special Function Registers for SM894051
4
$97
$8F
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M026
$9F
Ver:C SM894051 10 /2009
$87
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
Addr
93H
SFR
LEDENP1
Reset
FFH
95H
LEDENP3
FFH
97H
WDTKEY
00H
9FH
BFH
WDTC
SCONF
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
Unused
3
LEDEN
P13
LEDEN
P33
WDT
KEY3
Unused
Unused
2
LEDEN
P12
LEDEN
P32
WDT
KEY2
PS2
Reserve
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
Description
Operating temperature
Supply voltage
Supply voltage
Oscillator Frequency
Min.
-40
4.5
3.0
Typ.
25
5.0
3.3
Max.
85
5.5
3.6
25
Unit.
℃
V
V
MHz
Remarks
Ambient temperature under bias
DC Characteristic
VCC = 5V (±10%), VSS=0V TA= -40℃ to 85℃
SYMBOL
VCC
Supply Voltage
ICC
Supply current operating
IID
Supply current IDLE Mode
IPD
Supply current Power-Down MODE
VIL1
VIL2
VIH1
VIH2
IIL
ITL
ILI
VOL1
VOL2
VOH1
ISK1
ISK2
ISR1
RRST
CIO
TEST
CONDITIONS
PARAMETER
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
LIMITS
MIN
4.5
MAX
UNIT
5.5
V
15
mA
5
mA
20
μA
VIN = 0.45V
0.8
0.8
Vcc+0.5
Vcc+0.5
-50
V
V
V
V
μA
VIN = 2.0 V
-650
μA
0.45V < VIN < VCC-0.3V
OUTPUT
±10
μA
IOL = 8mA，VCC=5.0V
0.45
V
0.45
V
V
V
mA
mA
uA
kΩ
pF
See notes 1
fCLK = 12MHz VCC = 5.5V
See note 2
fCLK = 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
IOL = 6.5mA，VCC =5.0V
IOH = -80uA，VCC =5.0V
IOH = -80uA，VCC =5.0V
VCC = 5.0V, VIN = 0.4 V
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
2.4
50
6
20
-150
300
10
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M026
5
Ver:C SM894051 10 /2009
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
VCC = 3.3V (±10%), VSS=0V , TA= -40℃ to 85℃
SYMBOL
VCC
TEST
CONDITIONS
PARAMETER
Supply Voltage
3.0
See note 1
fCLK = 12MHz VCC = 3.6V
See note 2
fCLK = 12MHz VCC = 3.6V
P1.0 & P1.1 =0V
See note 3；VCC (= 3.6V)
P1.0 & P1.1 =0V
INPUT
VCC = 3.6V
VCC = 3.6V
VCC = 3.6V
ICC
Supply current operating
IID
Supply current IDLE Mode
IPD
Supply current Power-Down MODE
VIL1
VIL2
VIL3
Input LOW voltage, P1, P3
Input LOW voltage, RST
Input LOW voltage, XTAL1
VIH1
Input HIGH voltage, P1, P3
VCC = 3.6V
VIH2
Input HIGH voltage, RST
VCC = 3.6V
VIH3
Input HIGH voltage, XTAL1
IIN1
ITL
ILI
VOL1
VOL2
VOH1
ISK1
ISK2
ISR1
RRST
CIO
LIMITS
MIN
VCC = 3.6V
VCC = 3.0V ~3.6V,
Input current LOW level P1, P3
VIN = 0.45V.
See note 4
Transition current High to Low P3.0~P3.5, P3.7
VCC = 3.6V, VIN = 2.0 V
VCC = 3.0V ~3.6V,
Input leakage current P1.0~P1.1
0.45V<VIN<VCC
OUTPUT
Output LOW voltage, P1.2~P1.7, P3.0~P3.5,
IOL = 6mA，VCC =3.3V
P3.7
IOL = 5mA，VCC =3.3V
Output Low voltage P1.0~P1.1
IOH =-30uA，VCC =3.3V
Output High voltage P3.0~P3.5, P3.7
IOH =-30uA，VCC =3.3V
Output High voltage, P1.2~P1.7
Sink Current P1, P3
VCC = 3.3V, VIN = 0.4 V
Sink Current P1, P3 (LEDD Enable)
VCC = 3.3V, VIN = 0.4 V
Source Current P1, P3
VCC = 3.3V, VIN = 2.4 V
Internal RESET pull-down resistor
Test freq=1MHz, TA=25℃
Pin capacitance
0
0
0
0.6 VCC
-0.4
0.6 VCC
-0.4
0.8 VCC
UNIT
MAX
3.6
V
5.5
mA
2
mA
5
μA
0.2 VCC -0.2
0.2 VCC -0.2
0.2 VCC -0.2
V
V
V
VCC + 0.2
V
VCC + 0.2
V
VCC + 0.2
V
-10
50
μA
-75
400
μA
-10
10
μA
0.4
V
0.4
V
V
V
mA
mA
uA
kΩ
pF
2.4
2.4
50
4
12
-80
300
10
NOTES FOR DC ELECTRICAL CHARACTERISTICS
1.
The operating supply current is measured with all output disconnected;
XTAL1 driven with tr = tf = 5ns; VIL = VSS+0.5V; VIH=VCC-0.5V; XTAL2 not connect;
2.
The IDLE MODE supply current is measured with all output pins disconnected;
XTAL1 driven with tr = tf = 5ns; VIL = VSS+0.5V; VIH=VCC-0.5V; XTAL2 not connect;
3.
The POWER-DOWN MODE supply current is measured with all output pins disconnected;
VIL = VSS+0.5V; VIH=VCC-0.5V; XTAL2 not connect;
4.
Port 1, 3 source a transition current when they are being externally driven from HIGH to LOW. The transition current reaches its
maximum value when VIN is approximately 2V.
5.
Under steady state (non-transient) conditions, IOL must be externally
Limited as follows: Maximum IOL per port pin: 20mA
Maximum total IOL for all output pins: 80mA
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M026
6
Ver:C SM894051 10 /2009
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
ICC Active Mode Test Circuit:
V cc
11
VDD
Icc
VSS
XTAL1
RST
XTAL2
SM 894051
N C
C lo c k S ig n a l
V ss
AC Characteristic
VCC=3.3V±10%, VSS=0V, tclk min = 1/ fmax(maximum operating frequency)
TA= -40℃ to +85℃
Symbol
FIGURE
PARAMETER
MIN
MAX
UNIT
40(Note1)
20
20
3.33
10
10
-
ns
ns
ns
ns
ns
ns
MAX
UNIT
10tCLK-133
ns
ns
ns
ns
ns
External Clock drive into XTAL1
tCLK
4
tCLKH
4
tCLKL
4
tCLKR
4
tLLIV
4
tCYC
4
NOTES:
1. Operating at 25MHz.
Xtal1 Period
Xtal1 HIGH time
Xtal1 LOW time
XTAL1 rise time
XTAL1 fall time
Controller cycle time = tCLK / 12
Symbol
FIGURE
PARAMETER
MIN
tXLXL
tQVXH
tXHQX
tXHDX
tXHDV
5
5
5
5
5
Serial port clock time
Output data setup to clock rising edge
Output data hold after clock rising edge
Input data hold after clock rising edge
Clock rising edge to input data valid
UART
12tCLK
10tCLK-133
2tCLK-117
0
2.0V
2.0V
Test Points
0.8V
0.8V
Notes:
AC inputs during testing are driven at 2.4V for logic
“HIGH” and 0.45V for logic “LOW”. Timing
measurements are at 2.0V for logic “HIGH” and 0.8V
Figure 4 AC Testing Input/Output
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M026
7
Ver:C SM894051 10 /2009
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
Instruction
0
1
2
3
4
5
6
7
8
ALE
t XLXL
CLOCK
t XHQX
t QVXH
TXD
0
1
2
3
4
5
6
VALID
VALID
7
t XHDX
t XHDV
RxD
VALID
VALID
VALID
VALID
VALID
VALID
Figure5 UART waveform in Shift Register MODE
Instruction Set
The SM894051 uses the powerful instruction set of 80C51. It consists of 45 single-byte, 47 two-byte, and 15 threebyte instructions. Among them 65 instruction are executed in 1 machine-cycle, 40 instructions in 2 machine-cycles,
and the multiply, 2 instructions in 4 machine-cycles.
A summary of the instruction set is given in Table 3.
Addressing Mode
Notes on instruction set and address modes:
Rn
direct
Register R7-R0 of the currently selected register bank.
8-bits internal data location’s address. This could be internal DATA RAM location (0-127) or a
SFR [i.e., I/O port, control register, status register, etc. (128-255)]
8-bits RAM location addressed indirectly through register R1 or R0 of the actual register bank
8-bits constant included in the instruction
16-bits constant included in the instruction
11-bits destination address. Used by ACALL and AJMP. The branch can be anywhere within the
same 2 Kbytes page of program memory as the first byte of the following instruction.
Signed (2’s complement) 8-bits offset byte. Used by SJMP and all conditional jumps. Range is
-128 to +127 bytes relative to first byte of the following instruction.
Direct addressed bit in internal data RAM or SFR
@Ri
#data
#data16
addr11
rel
bit
Table 3: A Summary of the instruction set
Mnemonic
Arithmetic Instructions
ADD
A,Rn
ADD
A,direct
ADD
A,@Ri
ADD
A,#data
ADDC
A,Rn
OPERATION
BYTE
CYCLE
A = A + Rn
A = A + direct
A = A + <@Ri>
A = A + #data
A = A + Rn + C
1
2
1
2
1
1
1
1
1
1
ADDC
A,direct
A = A + direct + C
2
1
ADDC
ADDC
SUBB
SUBB
SUBB
SUBB
INC
INC
INC
INC
A,@Ri
A,#data
A,Rn
A,direct
A,@Ri
A,#data
A
Rn
direct
@Ri
A = A + @Ri + C
A = A + #data + C
A = A － Rn － C
A = A － direct － C
A = A － <@Ri> － C
A = A－#data － C
A=A+1
Rn = Rn + 1
direct = direct + 1
<@Ri> = <@Ri> + 1
1
2
1
2
1
2
1
1
2
1
1
1
1
1
1
1
1
1
1
1
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M026
8
Ver:C SM894051 10 /2009
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
DEC
DEC
DEC
DEC
INC
MUL
DIV
A
Rn
direct
@Ri
DPTR
AB
AB
DA
A
Logical Instructions
ANL
A,Rn
ANL
A,direct
ANL
A,@Ri
ANL
A,#data
ANL
direct,A
ANL
direct,#data
ORL
A,Rn
ORL
A,direct
ORL
A,@Ri
ORL
A,#data
ORL
direct,A
ORL
direct,#data
XRL
A,Rn
XRL
A,direct
XRL
A,@Ri
XRL
A,#data
XRL
direct,A
XRL
direct,#data
CLR
A
CPL
A
RL
A
RLC
A
RR
A
RRC
A
SWAP
A
Data Transfers Instructions
MOV
A,Rn
MOV
A,direct
MOV
A,@Ri
MOV
A,#data
MOV
Rn,A
MOV
Rn,direct
MOV
Rn,#data
MOV
direct,A
MOV
direct,Rn
MOV
direct,direct
MOV
direct,@Ri
MOV
direct,#data
MOV
@Ri,A
MOV
@Ri,direct
MOV
@Ri,#data
MOV
DPTR,#data16
MOVC
A,@A+DPTR
MOVC
A,@A+PC
PUSH
direct
POP
direct
XCH
A,Rn
XCH
A,direct
XCH
A,@Ri
XCHD
A,@Ri
Boolean Instructions
CLR
C
CLR
bit
SETB
C
SETB
bit
CPL
C
CPL
bit
A=A － 1
Rn = Rn － 1
direct = direct － 1
<@Ri> = <@Ri> － 1
DPTR = DPTR － 1
B:A = A × B
A = INT (A/B)
B = MOD (A/B)
Decimal adjust ACC
1
1
2
1
1
1
1
1
1
1
1
2
4
4
1
1
A .AND. Rn
A .AND. direct
A .AND. <@Ri>
A .AND. #data
direct .AND. A
direct .AND. #data
A .OR. Rn
A .OR. direct
A .OR. <@Ri>
A .OR. #data
direct .OR. A
direct .OR. #data
A .XOR. Rn
A .XOR. direct
A .XOR. <@Ri>
A .XOR. #data
direct .XOR. A
direct .XOR. #data
A=0
A = /A
Rotate ACC Left 1 bit
Rotate Left through Carry
Rotate ACC Right 1 bit
Rotate Right through Carry
Swap Nibbles in A
1
2
1
2
2
3
1
2
1
2
2
3
1
2
1
2
2
3
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
2
1
1
1
1
1
2
1
1
1
1
1
1
1
A = Rn
A = direct
A = <@Ri>
A = #data
Rn = A
Rn = direct
Rn = #data
direct = A
direct = Rn
direct = direct
direct = <@Ri>
direct = #data
<@Ri> = A
<@Ri> = direct
<@Ri> = #data
DPTR = #data16
A = code memory[A+DPTR]
A = code memory[A+PC]
INC SP: MOV “@’SP’, < direct >
MOV < direct >, “@SP”: DEC SP
ACC and < Rn > exchange data
ACC and < direct > exchange data
ACC and < Ri > exchange data
ACC and @Ri exchange low nibbles
1
2
1
2
1
2
2
2
2
3
2
2
1
2
2
3
1
1
2
2
1
2
1
1
1
1
1
1
1
2
1
1
2
2
2
1
1
2
1
2
2
2
2
2
1
1
1
1
C=0
bit = 0
C=1
bit = 1
C = /C
bit = /bit
1
2
1
2
1
2
1
1
1
1
1
1
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M026
9
Ver:C SM894051 10 /2009
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
ANL
C,bit
ANL
C,/bit
ORL
C,bit
ORL
C,/bit
MOV
C,bit
MOV
bit,C
JC
rel
JNC
rel
JB
bit,rel
JNB
bit,rel
JBC
bit,rel
Jump Instructions
ACALL
addr11
LCALL
addr16
RET
RETI
AJMP
addr11
LJMP
addr16
SJMP
rel
JMP
@A+DPTR
JZ
rel
JNZ
rel
CJNE
A, direct,rel
CJNZ
A, #data,rel
CJNZ
Rn, #data,rel
CJNZ
@Ri, #data,rel
DJNZ
Rn,rel
DJNZ
direct,rel
NOP
C = C .AND. bit
C = C .AND. /bit
C = C .OR. bit
C = C .OR. /bit
C = bit
bit = C
Jump if C= 1
Jump if C= 0
Jump if bit = 1
Jump if bit = 0
Jump if C = 1
2
2
2
2
2
2
2
2
3
3
3
2
2
2
2
1
2
2
2
2
2
2
Call Subroutine only at 2k bytes Address
Call Subroutine in max 64K bytes Address
Return from subroutine
Return from interrupt
Jump only at 2k bytes Address
Jump to max 64K bytes Address
Jump on at 256 bytes
Jump to A+ DPTR
Jump if A = 0
Jump if A ≠ 0
Jump if A ≠ < direct >
Jump if A ≠ < #data >
Jump if Rn ≠ < #data >
Jump if @Ri ≠ < #data >
Decrement and jump if Rn not zero
Decrement and jump if direct not zero
No Operation
2
3
1
1
2
3
2
1
2
2
3
3
3
3
2
3
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
1
Limited on Certain Instructions
Branching instructions:
The certain instructions related to branching or jumping should be restricted. When the programmer execute the
branching instructions like AJMP, LJMP, ACALL, LCALL, SJMP etc..., they have responsibility to ensure that the
destination branching address don’t be over internal program memory size. SM894051 contain 4K bytes program
memory and its location is from 00H to 0FFFH.
Data Memory, MOVX-related instructions:
SM894051 contains 128 bytes internal data memory, and it doesn’t support external data memory access. Therefore,
SM894051 doesn’t include MOVX instructions.
Limited on down mode wake-up
SM894051 has two ways to wake-up power down mode. One of them is hardware reset. The other one is that using
external interrupt (#INT0, #INT1) to wake-up power down mode and the external interrupt must be set for level
trigger.
I/O Pin Configuration
Port 1:
The ports P1.2 to P1.7 have internal pull-up resistor. The ports P1.0 to P1.1 are open-drain configuration, so they
require external pull-up resistor to pull low. And P1.0 and P1.1 also used as the positive input (AIN0) and the
negative input (AIN1) of the on chip analog comparator.
As long as the voltage level of P1.0 is greater than P1.1, the output voltage level of the on-chip analog comparator is
“1 “. And this result will be stored in the bit 6 of the port 3 SFR.
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M026
10
Ver:C SM894051 10 /2009
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
Port 3:
The Port 3 are 7-bits bi-directional I/O pins which include P3.0 to P3.5 and P3.7. The P3.6 doesn't be used as general
purpose I/O pin, and the output pin of the on-chip analog comparator connects to the P3.6 which is hard-wired as an
input.
I/O are provided with LED driving capacity
LEDEN (LEDENP1, 93H)
Bit7
Bit6
LEDEN
LEDEN
P17
P16
Bit5
LEDEN
P15
Bit4
LEDEN
P14
Bit3
LEDEN
P13
Bit2
LEDEN
P12
Bit1
LEDEN
P11
Bit0
LEDEN
P10
LEDEN (LEDENP3, 95H)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
LEDEN
Unused
LEDEN
LEDEN
LEDEN
LEDEN
LEDEN
LEDEN
P37
P35
P34
P33
P32
P31
P30
When I/O Ports (Port1 & Port3) output low voltage, they are provided with more sink current (IIL about 20mA) to
drive LED by setting LED enable bit.
For example, when setting LEDNP1 [0] to high then P1.0 is provided with more sink current (IIL) to drive LED. And
so on, each I/O can be set to drive LED by setting correspondent register.
Extension Function Description
Watch Dog Timer
The Watch Dog Timer (WDT) is a 16-bits free-running counter that generate reset signal if the counter overflows.
The WDT is useful for systems that are susceptible to noise, power glitches, or electronics discharge which causing
software dead loop or runaway. The WDT function can help user software recover from abnormal software condition.
The WDT is different from Timer0, Timer1 of general 8051. To prevent a WDT reset can be done by software
periodically clearing the WDT counter. User should check WDR bit of SCONF register whenever unpracticed reset
happened.
The purpose of the secure procedure is to prevent the WDTC value from being changed when system runaway.
There is a 250KHz RC oscillator embedded in chip. Set WDTE = “1” will enable the RC oscillator and the frequency
is independent to the system frequency.
To enable the WDT is done by setting 1 to the bit 7 (WDTE) of WDTC. After WDTE set to 1, the 16-bits counter
starts to count with the RC oscillator. It will generate a reset signal when overflows. The WDTE bit will be cleared to
0 automatically when SM894051 been reset, either hardware reset or WDT reset.
To reset the WDT is done by setting 1 to the CLEAR bit of WDTC before the counter overflow. This will clear the
content of the 16-bits counter and let the counter re-start to count from the beginning.
Watch Dog Timer Registers
Watch Dog Key Register
WDTKEY ($97)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
WDT KEY7 WDT KEY6 WDT KEY5 WDT KEY4 WDT KEY3 WDT KEY2 WDT KEY1 WDT KEY0
By default, the WDTC is read only. User needs to write values 1EH, 0E1H sequentially to the WDTKEY (97H)
register to enable the WDTC write attribute, which is
MOV WDTKEY, # 01EH
MOV WDTKEY, # 0E1H
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M026
11
Ver:C SM894051 10 /2009
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
When WDTC is set, user need to write another values E1H, 1EH sequentially to the WDTKEY (97H) register to
disable the WDTC write attribute, That is
MOV WDTKEY, # 0E1H
MOV WDTKEY, # 01EH
Watch Dog Timer Registers - WDT Control Register
WDTC ($9F)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
WDTE
Reserve
CLEAR
Unused
Unused
PS2
WDTE: Watch Dog Timer enable bit
CLEAR: Watch Dog Timer reset bit
If CLEAR bit set to1, Watch Dog Timer will be reset. User don’t reset value to 0 .
PS [2:0] : Overflow period select bits
Bit1
PS1
Bit0
PS0
PS2~PS0: clock sourer divider bit
PS [2:0]
Overflow Period (ms)
000
2.048
001
4.096
010
8.192
011
16.384
100
32.768
101
65.536
110
131.072
111
262.14
Watch Dog Timer Register - System Control Register
SCONF ($BFH)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
WDR
Unused
Unused
Unused
Unused
Reserved
Unused
Unused
WDR: Watch Dog Timer Reset. When system reset by Watch Dog Timer overflow, WDR will be set to 1
ALEI: ALE output inhibit bit, to reduce EMI
Setting bit 0 (ALEI) of SCONF can inhibit the clock signal in Fosc/6Hz output to the ALE pin.
The bit 7 (WDR) of SCONF is Watch Dog Timer Reset bit. It will be set to 1 when reset signal generated by WDT
overflow. User should check WDR bit whenever unpredicted reset happened.
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M026
12
Ver:C SM894051 10 /2009
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
X'tal
C1
C2
R
16MHz
30 pF
30 pF
open
12MHz
30 pF
30 pF
open
XTAL2
Crystal
Application Reference
Valid for SM894051
X'tal
3MHz
6MHz
9MHz
C1
30 pF
30 pF
30 pF
C2
30 pF
30 pF
30 pF
R
open
open
open
SM894051
XTAL1
25MHz
15 pF
15 pF
62K C2
C1
VSS
NOTE:
Oscillation circuit may differ with different crystal or ceramic resonator in higher oscillation frequency which was due to
each crystal or ceramic resonator has its own characteristics.
User should check with the crystal or ceramic resonator manufacture for appropriate value of external components.
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M026
13
Ver:C SM894051 10 /2009
SyncMOS Technologies International, Inc.
SM894051
8-Bits Micro-controller
With4KBFlashROMembedded
MCU writer list
Company
Advantech
7F, No.98, Ming-Chung Rd., Shin-Tien City,
Taipei, Taiwan, ROC
Web site:
http://www.aec.com.tw
Contact info
Tel:02-22182325
Fax:02-22182435
E-mail:
[email protected]
Programmer Model Number
Lab Tool - 48XP/UXP
Lab Tool – 848/848XP
Hi-Lo
4F.,No.18,Lane 79,Rueiguang
Rd.,Neihu,Taipei,Taiwan R.O.C.
Web site:
http://www.hilosystems.com.tw
Tel: 02-87923301
Fax:02-87923285
E-mail:
[email protected]
All - 100 series
Leap
6th F1-4, Lane 609,
Chunghsin Rd., Sec. 5, Sanchung, Taipei ,
Taiwan, ROC
Web site:
http://www.leap.com.tw
Tel: 886-2-29991860
Fax:02-29990015
E-mail:
[email protected]
Leap-48
Xeltek Electronic Co., Ltd
Bldg 6-31 Meizhiguo garden, #2 Jiangjun
Ave., Jiangning, Nanjing, China 211100
Web site:
http://www.xeltek-cn.com
Tel: + 86-25-52765201,
E-mail:
[email protected]
[email protected]
Superpro 280U
Superpro 580U
Superpro 3000U
Superpro 9000U
Guangzhou Zhiyuan Electronic Co.,Ltd
Floor 2,No.7 building,Huangzhou Industrial
Estate,Chebei Road,Tianhe
district,Guangzhou,China 510660
Web site:
http://www.embedtools.com/
TEL: +86-20-28872449
E-mail:
[email protected]
SmartPRO 5000U/X8
TianJin Weilei technology ltd
Rm 357,Venturetech Center,12 Keyan West
Road Nankai District,Tianjin,P.R.C, 300192
Web site:
http://www.weilei.com.cn/
TEL: + 86-22-87891218#801
E-mail:
[email protected]
[email protected]
VP-890;VP-980;VP-880;VP-680
VP-480;VP-380;VP-280;VP-190
GuangZhou Chang Xingjinggong
Technology Development Co ., Ltd.
Room 102 , No.167 , CuiJing street ,
ChangXing road , TianHe district ,
GuangZhou.
Web site:
http://www.top2048.com/
TEL: + 86-20-61391469
E-mail:
[email protected]
TOP-2007
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M026
14
Ver:C SM894051 10 /2009