HOLTEK HT48F70E

HT48F70E
I/O Type 8-Bit Flash MCU With EEPROM
Technical Document
· Tools Information
· FAQs
· Application Note
Features
· Operating voltage:
· HALT function and wake-up feature reduce power
fSYS=4MHz: 2.2V~5.5V
fSYS=8MHz: 3.3V~5.5V
consumption
· 16-level subroutine nesting
· Low voltage reset function
· Up to 0.5ms instruction cycle with 8MHz system clock
· 56 bidirectional I/O lines (max.)
at VDD=5V
· 1 interrupt input shared with an I/O line
· Bit manipulation instruction
· 2´16-bit programmable timer/event counter with over-
· 16-bit table read instruction
flow interrupt
· 63 powerful instructions
· On-chip crystal and RC oscillator
· 106 erase/write cycles EEPROM data memory
· Watchdog Timer
· EEPROM data retention > 10 years
· 100,000 erase/write cycles Flash program memory
· All instructions in one or two machine cycles
· 8192´16 program memory ROM (Flash)
· In system programming (ISP)
· 256´8 data memory EEPROM
· 48-pin SSOP, 64-pin QFP package
· 224´8 data memory RAM
General Description
wake-up functions, watchdog timer, buzzer driver, as
well as low cost, enhance the versatility of these devices
to suit a wide range of application possibilities such as
industrial control, consumer products, subsystem controllers, etc.
The HT48F70E is an 8-bit high performance, RISC architecture microcontroller device specifically designed
for multiple I/O control product applications.
The advantages of low power consumption, I/O flexibility, timer functions, oscillator options, HALT and
Rev. 1.00
1
January 9, 2007
HT48F70E
Block Diagram
T M R 1 C
IN T
M
T M R 1 L
T M R 1 H
fS
U
Y S
X
/4
T M R 1
In te rru p t
C ir c u it
S T A C K
P ro g ra m
M e m o ry
P ro g ra m
C o u n te r
M
T M R 0 L
T M R 0 H
IN T C
U
fS
/4
Y S
X
T M R 0
T M R 0 C
E N /D IS
In s tr u c tio n
R e g is te r
M
M P
U
W D T S
X
D A T A
M e m o ry
W D T P r e s c a le r
P A C
P B C
A L U
T im in g
G e n e ra to r
P A
M U X
In s tr u c tio n
D e c o d e r
P O R T A
P O R T B
P B
S T A T U S
S h ifte r
P C C
P O R T C
P C
O S C 2
O S
R
V
V
C 1
E S
D D
S S
P D C
A C C
P O R T D
P D
P E C
B P
P O R T E
P E
P F C
P O R T F
P F
D a ta M e m o ry
E E P R O M
E E C R
P G C
P G
Rev. 1.00
2
P O R T G
W D T
M
U
fS
Y S
/4
X
W D T O S C
P A 0 ~ P A 7
P B 0 /B Z
P B 1 /B Z
P B 2 ~ P B 7
P C 0 ~ P C 7
P D 0 ~ P D 7
P E 0 ~ P E 7
P F 0 ~ P F 7
P G 0 ~ P G 7
January 9, 2007
HT48F70E
Pin Assignment
P A 6
P A 5
P A 4
P B 7
P B 6
P B 5
P B 4
P G 7
P G 6
P B 7
P G 5
P B 6
4 7
P G 4
4 8
2
P A 3
1
P A 2
P B 5
P B 4
P A 3
3
4 6
P A 4
P A 2
4
4 5
P A 5
P A 1
1
5 1
P A 7
P A 1
5
4 4
P A 6
P A 0
2
5 0
P F 0
P A 0
6
4 3
P A 7
P E 7
3
4 9
P F 1
4
4 8
P F 2
6 4 6 3 6 2 6 1 6 0
5 9 5 8 5 7 5 6 5 5 5 4 5 3 5 2
P B 3
7
4 2
P F 0
P E 6
P B 2
8
4 1
P F 1
P E 5
5
4 7
P F 3
P B 1 /B Z
9
4 0
P F 2
P E 4
6
4 6
O S C 2
P B 0 /B Z
1 0
3 9
P F 3
P B 3
7
4 5
O S C 1
P E 3
1 1
3 8
O S C 2
P B 2
8
4 4
P F 4
P E 2
1 2
3 7
O S C 1
P B 1 /B Z
9
4 3
P F 5
P E 1
1 3
3 6
V D D
P B 0 /B Z
1 0
P E 0
1 4
3 5
R E S
P E 3
1 1
P D 7
1 5
3 4
T M R 1
P E 2
1 2
4 0
V D D
P D 6
1 6
3 3
P D 3
P E 1
1 3
3 9
R E S
T M R 1
P D 5
1 7
3 2
P D 2
P D 4
1 8
3 1
P D 1
V S S
1 9
3 0
P D 0
P C 3
P D 1
3 4
P D 0
V S S
1 9
3 3
P C 7
H T 4 8 F 7 0 E
4 8 S S O P -A
2 0 2 1 2 2 2 3 2 4
2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2
P C 6
P C 4
2 5
3 5
1 8
P C 5
2 6
2 4
1 7
P C 4
2 3
P D 5
P D 4
P C 3
P C 1
P C 2
P D 2
P C 2
P C 5
3 6
P C 1
2 7
1 6
P C 0
2 2
P D 3
P D 6
P G 3
P C 0
3 7
P G 2
P C 6
3 8
1 5
P G 1
P C 7
2 8
P F 7
1 4
P G 0
2 9
2 1
P F 6
4 1
P E 0
T M R 0
2 0
4 2
P D 7
IN T
IN T
T M R 0
H T 4 8 F 7 0 E
6 4 Q F P -A
Pin Description
Pin Name
I/O
Options
Description
PA0~PA7
I/O
Wake-up
Pull-high*
CMOS or Schmitt
Input
Bidirectional 8-bit input/output port. Each pin can be configured as a wake-up
input by options. Software instructions determine if the pin is a CMOS output
or Schmitt trigger input or CMOS input with or without pull-high resistor (by
options).
PB0/BZ
PB1/BZ
PB2~PB7
I/O
Pull-high*
PB0 or BZ
PB1 or BZ
Bidirectional 8-bit input/output port. Software instructions determine if the pin
is a CMOS output or Schmitt trigger input with pull-high resistor (determined
by pull-high options).
The PB0 and PB1 are pin-shared with BZ and BZ respectively. Once the PB0
or PB1 is selected as buzzer driving output, the output signals come from an
internal PFD generator (shared with timer/event counter).
PC0~PC7
I/O
Pull-high*
Bidirectional 8-bit input/output port. Software instructions determine the
CMOS output or Schmitt trigger input (pull-high depends on options).
PD0~PD7
I/O
Pull-high*
Bidirectional 8-bit input/output port. Software instructions determine if the pin
is a CMOS output or Schmitt trigger input (pull-high depends on options).
PE0~PE7
I/O
Pull-high*
Bidirectional 8-bit input/output port. Software instructions determine if the pin
is a CMOS output or Schmitt trigger input (pull-high depends on options).
PF0~PF7
I/O
Pull-high*
Bidirectional 8-bit input/output port. Software instructions determine if the pin
is a CMOS output or Schmitt trigger input (pull-high depends on options).
PG0~PG7
I/O
Pull-high*
Bidirectional 8-bit input/output port. Software instructions determine if the pin
is a CMOS output or Schmitt trigger input (pull-high depends on options).
INT
I
¾
External interrupt Schmitt trigger without pull-high resistor.
Edge trigger is activated during high to low transition.
TMR0
I
¾
Schmitt trigger input for Timer/Event Counter 0
Rev. 1.00
3
January 9, 2007
HT48F70E
Pin Name
I/O
Options
TMR1
I
¾
Schmitt trigger input for Timer/Event Counter 1
RES
I
¾
Schmitt trigger reset input, active low.
VSS
¾
¾
Negative power supply, ground
VDD
¾
¾
Positive power supply
OSC1
OSC2
I
O
Crystal
or RC
Note:
Description
OSC1 and OSC2 are connected to an RC network. For RC operation, OSC2
is an output terminal for 1/4 system clock.
* The pull-high resistors of each I/O port (PA, PB, PC, PD, PE, PF, PG) are controlled by options.
CMOS or Schmitt trigger option of port A is controlled by an option.
Absolute Maximum Ratings
Supply Voltage ...........................VSS-0.3V to VSS+6.0V
Storage Temperature ............................-50°C to 125°C
Input Voltage..............................VSS-0.3V to VDD+0.3V
Operating Temperature...........................-40°C to 85°C
IOL Total ..............................................................150mA
IOH Total............................................................-100mA
Total Power Dissipation .....................................500mW
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed
in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
D.C. Characteristics
Symbol
VDD
IDD1
Parameter
Operating Voltage
Ta=25°C
Test Conditions
Conditions
VDD
¾
5.5
V
¾
fSYS=8MHz
3.3
¾
5.5
V
¾
1
2
mA
¾
3
5
mA
¾
1
2
mA
¾
2.5
4
mA
¾
4
8
mA
¾
¾
5
mA
¾
¾
10
mA
¾
¾
1
mA
¾
¾
2
mA
3V
Operating Current (RC OSC)
No load, fSYS=4MHz
No load, fSYS=4MHz
5V
ISTB1
Standby Current (WDT Enabled)
5V
No load, fSYS=8MHz
3V
No load*, system HALT
5V
ISTB2
Unit
2.2
3V
Operating Current
(Crystal OSC, RC OSC)
Max.
fSYS=4MHz
Operating Current (Crystal OSC)
IDD3
Typ.
¾
5V
IDD2
Min.
3V
Standby Current (WDT Disabled)
No load*, system HALT
5V
VIL1
Input Low Voltage for I/O Ports
¾
¾
0
¾
0.3VDD
V
VIH1
Input High Voltage for I/O Ports
¾
¾
0.7VDD
¾
VDD
V
VIL2
Input Low Voltage (RES)
¾
¾
0
¾
0.4VDD
V
VIH2
Input High Voltage (RES)
¾
¾
0.9VDD
¾
VDD
V
VLVR
Low Voltage Reset
¾
LVR enabled
2.7
3.0
3.3
V
IOL
3V
VOL=0.1VDD
4
8
¾
mA
I/O Port Sink Current
5V
VOL=0.1VDD
10
20
¾
mA
Rev. 1.00
4
January 9, 2007
HT48F70E
Symbol
IOH
RPH
Parameter
Test Conditions
VDD
Conditions
Min.
Typ.
Max.
Unit
3V
VOH=0.9VDD
-2
-4
¾
mA
5V
VOH=0.9VDD
-5
-10
¾
mA
20
60
100
kW
10
30
50
kW
I/O Port Source Current
3V
¾
Pull-high Resistance
5V
Note: ²*² All tests are conducted with the I/O pins setup as outputs and set to a low value.
A.C. Characteristics
Symbol
fSYS1
fSYS2
fTIMER
tWDTOSC
Parameter
System Clock (Crystal OSC)
System Clock (RC OSC)
Timer I/P Frequency
(TMR0/TMR1)
Ta=25°C
Test Conditions
Conditions
VDD
Min.
Typ.
Max.
Unit
¾
2.2V~5.5V
400
¾
4000
kHz
¾
3.3V~5.5V
400
¾
8000
kHz
¾
2.2V~5.5V
400
¾
4000
kHz
¾
3.3V~5.5V
400
¾
8000
kHz
¾
2.2V~5.5V
0
¾
4000
kHz
¾
3.3V~5.5V
0
¾
8000
kHz
3V
¾
43
86
168
ms
5V
¾
36
72
144
ms
11
22
43
ms
9
18
37
ms
Watchdog Oscillator Period
tWDT1
Watchdog Time-out Period
(WDT OSC)
3V
tWDT2
Watchdog Time-out Period
(System Clock)
¾
Without WDT prescaler
¾
1024
¾
tSYS
tRES
External Reset Low Pulse Width
¾
¾
1
¾
¾
ms
tSST
System Start-up Timer Period
¾
¾
1024
¾
tSYS
tINT
Interrupt Pulse Width
¾
1
¾
¾
ms
Rev. 1.00
Without WDT prescaler
5V
Wake-up from HALT
¾
5
January 9, 2007
HT48F70E
Functional Description
Execution Flow
incremented by one. The program counter then points to
the memory word containing the next instruction code.
The HT48F70E system clock is derived from either a
crystal or an RC oscillator and is internally divided into
four non-overlapping clocks. One instruction cycle consists of four system clock cycles.
When executing a jump instruction, conditional skip execution, loading PCL register, subroutine call or return
from subroutine, initial reset, internal interrupt, external
interrupt or return from interrupts, the PC manages program transfer by loading the address corresponding to
each instruction.
Instruction fetching and execution are pipelined in such a
way that a fetch takes an instruction cycle while decoding
and execution takes the next instruction cycle. The
pipelining scheme ensures that each instructions are effectively executed in one cycle. Exceptions to this are instructions that change the contents of the program
counter, such as subroutine calls or jumps, in which case,
two cycles are required to complete the instruction.
The conditional skip is activated by instructions. Once
the condition is met, the next instruction, fetched during
the current instruction execution, is discarded and a
dummy cycle replaces it to get the proper instruction.
Otherwise proceed to the next instruction.
The lower byte of the program counter (PCL) is a readable and writeable register (06H). Moving data into the
PCL performs a short jump. The destination will be
within the current program ROM page.
Program Counter - PC
The program counter (PC) controls the sequence in
which the instructions stored in the program ROM are
executed and its contents specify a full range of program memory.
When a control transfer takes place, an additional
dummy cycle is required.
After accessing a program memory word to fetch an instruction code, the contents of the program counter are
S y s te m
C lo c k
T 1
T 2
T 3
T 4
T 1
T 2
T 3
T 4
T 1
T 2
T 3
T 4
O S C 2 ( R C o n ly )
P C
P C
P C + 1
F e tc h IN S T (P C )
E x e c u te IN S T (P C -1 )
P C + 2
F e tc h IN S T (P C + 1 )
E x e c u te IN S T (P C )
F e tc h IN S T (P C + 2 )
E x e c u te IN S T (P C + 1 )
Execution Flow
Program Counter
Mode
*12
*11
*10
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
Initial Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
External Interrupt
0
0
0
0
0
0
0
0
0
0
1
0
0
Timer/Event Counter 0 Overflow
0
0
0
0
0
0
0
0
0
1
0
0
0
Timer/Event Counter 1 Overflow
0
0
0
0
0
0
0
0
0
1
1
0
0
@4
@3
@2
@1
@0
Skip
Program Counter+2
Loading PCL
*12
*11
*10
*9
*8
@7
@6
@5
Jump, Call Branch
#12
#11
#10
#9
#8
#7
#6
#5
#4
#3
#2
#1
#0
Return from Subroutine
S12
S11
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
S0
Program Counter
Note: *12~*0: Program counter bits
S12~S0: Stack register bits
#12~#0: Instruction code bits
Rev. 1.00
@7~@0: PCL bits
6
January 9, 2007
HT48F70E
In System Programming
Certain locations in the program memory are reserved
for special usage:
In system programming allows programming and reprogramming of HT48FXXE microcontroller on application
circuit board, this will save time and money, both during
development in the lab. Using a simple 3-wire interface,
the ISP communicates serially with the HT48FXXE
microcontroller, reprogramming program memory and
EEPROM data memory on the chip.
Pin Name
Function
PA0
SDATA
Serial data input/output
PA4
SCLK
Serial clock input
RES
RESET
Device reset
VDD
VDD
Power supply
VSS
VSS
Ground
· Location 000H
This area is reserved for program initialization. After
chip reset, the program always begins execution at location 000H.
· Location 004H
This area is reserved for the external interrupt service
program. If the INT interrupt pin is activated, the interrupt enabled and the stack is not full, the program begins execution at location 004H.
Description
· Location 008H
This area is reserved for the Timer/Event Counter 0 interrupt service program. If a timer interrupt results from a
Timer/Event Counter 0 overflow, and if the interrupt is
enabled and the stack is not full, the program begins execution at location 008H.
ISP Pin Assignments
Program Memory - ROM
· Location 00CH
This location is reserved for the Timer/Event Counter
1 interrupt service program. If a timer interrupt results
from a Timer/Event Counter 1 overflow, and the interrupt is enabled and the stack is not full, the program
begins execution at location 00CH.
The program memory is used to store the program instructions which are to be executed. It also contains
data, table, and interrupt entries, and is organized into
8192´16 bits, addressed by the program counter and table pointer.
· Table location
0 0 0 H
D e v ic e In itia liz a tio n P r o g r a m
0 0 4 H
Any location in the program memory can be used as
look-up tables where programmers can store fixed
data. The instructions ²TABRDC [m]² (the current
page, one page=256 words) and ²TABRDL [m]² (the
last page) transfer the contents of the lower-order byte
to the specified data memory, and the higher-order
byte to TBLH (08H). The Table Higher-order byte register (TBLH) is read only. The table pointer (TBLP) is a
read/write register (07H), which indicates the table location. Before accessing the table, the location must
be placed in the TBLP. The TBLH is read only and
cannot be restored. If the main routine and the ISR
(Interrupt Service Routine) both employ the table read
instruction, the contents of the TBLH in the main routine are likely to be changed by the table read instruction used in the ISR. Errors can occur. In other words,
using the table read instruction in the main routine and
the ISR simultaneously should be avoided. However,
if the table read instruction has to be applied in both
the main routine and the ISR, the interrupt is supposed to be disabled prior to the table read instruction.
E x te r n a l In te r r u p t S u b r o u tin e
0 0 8 H
T im e r /E v e n t C o u n te r 0
In te r r u p t S u b r o u tin e
0 0 C H
T im e r /E v e n t C o u n te r 1
In te r r u p t S u b r o u tin e
P ro g ra m
M e m o ry
n 0 0 H
L o o k - u p T a b le ( 2 5 6 w o r d s )
n F F H
L o o k - u p T a b le ( 2 5 6 w o r d s )
1 F F F H
1 6 b its
N o te : n ra n g e s fro m
0 to 1 F
Program Memory
Instruction
Table Location
*12
*11
*10
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
TABRDC [m]
P12
P11
P10
P9
P8
@7
@6
@5
@4
@3
@2
@1
@0
TABRDL [m]
1
1
1
1
1
@7
@6
@5
@4
@3
@2
@1
@0
Table Location
Note: *12~*0: Table location bits
P12~P8: Current program counter bits
@7~@0: Table pointer bits
Rev. 1.00
7
January 9, 2007
HT48F70E
It will not be enabled until the TBLH has been backed
up. All table related instructions require two cycles to
complete the operation. These areas may function as
normal program memory depending upon the requirements.
0 0 H
Stack Register - STACK
This is a special part of the memory which is used to
save the contents of the Program Counter only. The
stack is organized into 16 levels and is neither part of the
data nor part of the program space, and is neither readable nor writable. The activated level is indexed by the
Stack Pointer (SP) and is neither readable nor writeable.
At a subroutine call or interrupt acknowledge signal, the
contents of the program counter are pushed onto the
stack. At the end of a subroutine or an interrupt routine,
signaled by a return instruction (RET or RETI), the program counter is restored to its previous value from the
stack. After a chip reset, the Stack Pointer will point to
the top of the stack.
If the stack is full and a non-masked interrupt takes
place, the interrupt request flag will be recorded but the
acknowledge signal will be inhibited. When the stack
pointer is decremented (by RET or RETI), the interrupt
will be serviced. This feature prevents stack overflow allowing the programmer to use the structure more easily.
In a similar case, if the stack is full and a ²CALL² is subsequently executed, stack overflow occurs and the first
entry will be lost (only the most recent 16 return addresses are stored).
In d ir e c t A d d r e s s in g R e g is te r 0
0 1 H
M P 0
0 2 H
In d ir e c t A d d r e s s in g R e g is te r 1
0 3 H
M P 1
0 4 H
B P
0 5 H
A C C
0 6 H
P C L
0 7 H
T B L P
0 8 H
T B L H
0 9 H
W D T S
0 A H
S T A T U S
0 B H
IN T C
0 C H
T M R 0 H
0 D H
T M R 0 L
0 E H
T M R 0 C
0 F H
T M R 1 H
1 0 H
T M R 1 L
1 1 H
T M R 1 C
1 2 H
P A
1 3 H
P A C
1 4 H
P B
1 5 H
P B C
1 6 H
P C
1 7 H
P C C
1 8 H
P D
1 9 H
P D C
1 A H
P E
1 B H
P E C
1 C H
P F
1 D H
P F C
1 E H
P G
1 F H
2 0 H
P G C
4 0 H
E E C R
G e n e ra l P u rp o s e
D a ta M e m o ry
(2 2 4 B y te s )
F F H
B a n k 0
Data Memory - RAM
B a n k 1
RAM Mapping
The data memory has a capacity of 256´8 bits and is
divided into two functional groups: special function registers and general purpose data memory (224´8). Most
are read/write, but some are read only.
The memory pointer registers (MP0 and MP1) are 8-bit
registers used to access the RAM by combining corresponding indirect addressing registers. MP0 can only be
applied to data memory in Bank 0, while MP1 can be applied to data memory in Bank 0 and Bank 1.
The general purpose data memory, addressed from 20H
to FFH, is used for data and control information under instruction commands.
Accumulator
All of the data memory areas can handle arithmetic,
logic, increment, decrement and rotate operations directly. Except for some dedicated bits, each bit in the
data memory can be set and reset by ²SET [m].i² and
²CLR [m].i². They are also indirectly accessible through
memory pointer registers (MP0 or MP1). The control
register of the EEPROM data memory is located at
[40H] in Bank 1.
The accumulator is closely related with operations carried out by the ALU. It is mapped to location 05H of the
data memory and can carry out immediate data operations. The data movement between two data memory locations must pass through the accumulator.
Arithmetic and Logic Unit - ALU
This circuit performs 8-bit arithmetic and logic operations.
The ALU provides the following functions:
Indirect Addressing Register
· Arithmetic operations (ADD, ADC, SUB, SBC, DAA)
Location 00H and 02H are indirect addressing registers
that are not physically implemented. Any read/write operation of [00H] ([02H]) will access data memory pointed
to by MP0 (MP1). Reading location 00H (02H) itself indirectly will return the result 00H. Writing indirectly results
in no operation.
Rev. 1.00
S p e c ia l P u r p o s e
D a ta M e m o ry
· Logic operations (AND, OR, XOR, CPL)
· Rotation (RL, RR, RLC, RRC)
· Increment and Decrement (INC, DEC)
· Branch decision (SZ, SNZ, SIZ, SDZ ....)
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HT48F70E
interrupt requests may occur during this interval but only
the interrupt request flag is recorded. If a certain interrupt requires servicing within the service routine, the
EMI bit and the corresponding bit of the INTC may be set
to allow interrupt nesting. If the stack is full, the interrupt
request will not be acknowledged, even if the related interrupt is enabled, until the SP is decremented. If immediate service is desired, the stack must be prevented from
becoming full.
The ALU not only saves the results of a data operation but
also changes the status register.
Status Register - STATUS
This 8-bit register (0AH) contains the zero flag (Z), carry
flag (C), auxiliary carry flag (AC), overflow flag (OV),
power down flag (PDF), and watchdog time-out flag
(TO). It also records the status information and controls
the operation sequence.
All these kinds of interrupts have a wake-up capability.
As an interrupt is serviced, a control transfer occurs by
pushing the program counter onto the stack, followed by
a branch to a subroutine at specified location in the program memory. Only the program counter is pushed onto
the stack. If the contents of the register or status register
(STATUS) are altered by the interrupt service program
which corrupts the desired control sequence, the contents should be saved in advance.
With the exception of the TO and PDF flags, bits in
the status register can be altered by instructions like
most other registers. Any data written into the status
register will not change the TO or PDF flag. In addition, operations related to the status register may
give different results from those intended. The TO
flag can be affected only by a system power-up, a
WDT time-out or executing the ²CLR WDT² or
²HALT² instruction. The PDF flag can be affected
only by executing the ²HALT² or ²CLR WDT² instruction or during a system power-up.
External interrupts are triggered by a high to low transition of the INT and the related interrupt request flag (EIF;
bit 4 of INTC) will be set. When the interrupt is enabled,
the stack is not full and the external interrupt is active, a
subroutine call to location 04H will occur. The interrupt
request flag (EIF) and EMI bits will be cleared to disable
other interrupts.
The Z, OV, AC and C flags generally reflect the status of
the latest operations.
In addition, on entering the interrupt sequence or executing the subroutine call, the status register will not be
pushed onto the stack automatically. If the contents of
the status are important and if the subroutine can corrupt the status register, precautions must be taken to
save it properly.
The internal Timer/Event Counter 0 interrupt is initialized
by setting the Timer/Event Counter 0 interrupt request
flag (T0F; bit 5 of INTC), caused by a timer 0 overflow.
When the interrupt is enabled, the stack is not full and the
T0F bit is set, a subroutine call to location 08H will occur.
The related interrupt request flag (T0F) will be reset and
the EMI bit cleared to disable further interrupts.
Interrupt
The device provides an external interrupt and internal
timer/event counter interrupts. The Interrupt Control
Register (INTC;0BH) contains the interrupt control bits
to set the enable or disable and the interrupt request
flags.
The internal timer/even counter 1 interrupt is initialized
by setting the Timer/Event Counter 1 interrupt request
flag (T1F;bit 6 of INTC), caused by a timer 1 overflow.
When the interrupt is enabled, the stack is not full and
the T1F is set, a subroutine call to location 0CH will occur. The related interrupt request flag (T1F) will be reset
and the EMI bit cleared to disable further interrupts.
Once an interrupt subroutine is serviced, all the other interrupts will be blocked (by clearing the EMI bit). This
scheme may prevent any further interrupt nesting. Other
Bit No.
Label
Function
0
C
C is set if an operation results in a carry during an addition operation or if a borrow does not
take place during a subtraction operation; otherwise C is cleared. C is also affected by a rotate through carry instruction.
1
AC
AC is set if an operation results in a carry out of the low nibbles in addition or no borrow from
the high nibble into the low nibble in subtraction; otherwise AC is cleared.
2
Z
Z is set if the result of an arithmetic or logic operation is zero; otherwise Z is cleared.
3
OV
OV is set if an operation results in a carry into the highest-order bit but not a carry out of the
highest-order bit, or vice versa; otherwise OV is cleared.
4
PDF
PDF is cleared by a system power-up or executing the ²CLR WDT² instruction. PDF is set
by executing the ²HALT² instruction.
5
TO
TO is cleared by a system power-up or executing the ²CLR WDT² or HALT instruction. TO is
set by a WDT time-out.
6~7
¾
Unused bit, read as ²0²
Status (0AH) Register
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HT48F70E
Bit No.
Label
0
EMI
Function
Controls the master (global) interrupt (1= enabled; 0= disabled)
1
EEI
Controls the external interrupt (1= enabled; 0= disabled)
2
ET0I
Controls the Timer/Event Counter 0 interrupt (1= enabled; 0= disabled)
3
ET1I
Controls the Timer/Event Counter 1 interrupt (1= enabled; 0= disabled)
4
EIF
External interrupt request flag (1= active; 0= inactive)
5
T0F
Internal Timer/Event Counter 0 request flag (1= active; 0= inactive)
6
T1F
Internal Timer/Event Counter 1 request flag (1= active; 0= inactive)
7
¾
Unused bit, read as ²0²
INTC (0BH) Register
All of them are designed for system clocks, namely the
external RC oscillator, the external Crystal oscillator,
which are determined by options. No matter what oscillator type is selected, the signal provides the system
clock. The HALT mode stops the system oscillator and
ignores an external signal to conserve power.
During the execution of an interrupt subroutine, other interrupt acknowledge signals are held until the ²RETI² instruction is executed or the EMI bit and the related
interrupt control bit are set to 1 (if the stack is not full). To
return from the interrupt subroutine, ²RET² or ²RETI²
may be invoked. RETI will set the EMI bit to enable an interrupt service, but RET will not.
If an RC oscillator is used, an external resistor between
OSC1 and VDD is required and the resistance must
range from 24kW to 1MW. The system clock, divided by
4, is available on OSC2, which can be used to synchronize external logic. The RC oscillator provides the most
cost effective solution. However, the frequency of oscillation may vary with VDD, temperatures and the chip itself due to process variations. It is, therefore, not
suitable for timing sensitive operations where an accurate oscillator frequency is desired.
Interrupts, occurring in the interval between the rising
edges of two consecutive T2 pulses, will be serviced on
the latter of the two T2 pulses, if the corresponding interrupts are enabled. In the case of simultaneous requests
the following table shows the priority that is applied.
These can be masked by resetting the EMI bit.
Interrupt Source
Priority
Vector
External Interrupt
1
04H
Timer/Event Counter 0 Overflow
2
08H
Timer/Event Counter 1 Overflow
3
0CH
If a Crystal oscillator is used, a crystal across OSC1 and
OSC2 is needed to provide the feedback and phase
shift required for the oscillator. No other external components are required. In stead of a crystal, a resonator can
also be connected between OSC1 and OSC2 to get a
frequency reference, but two external capacitors in
OSC1 and OSC2 are required.
Once the interrupt request flags (T0F, T1F, EIF) are set,
they will remain in the INTC register until the interrupts
are serviced or cleared by a software instruction. It is
recommended that a program does not use the ²CALL
subroutine² within the interrupt subroutine. Interrupts often occur in an unpredictable manner or need to be serviced immediately in some applications. If only one stack
is left and enabling the interrupt is not well controlled, the
original control sequence will be damaged once the
²CALL² operates in the interrupt subroutine.
The WDT oscillator is a free running on-chip RC oscillator, and no external components are required. Even if
the system enters the power down mode, the system
clock is stopped, but the WDT oscillator still works within
a period of approximately 65ms at 5V. The WDT oscillator can be disabled by options to conserve power.
Oscillator Configuration
There are 2 oscillator circuits in the microcontroller.
V
O S C 1
D D
O S C 1
4 7 0 p F
O S C 2
C r y s ta l O s c illa to r
fS Y S /4
N M O S O p e n D r a in
O S C 2
R C
O s c illa to r
System Oscillator
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Watchdog Timer - WDT
The WDT overflow under normal operation will initialize
a ²chip reset² and set the status bit ²TO². But in the
HALT mode, the overflow will initialize a ²warm reset²
and only the Program Counter and SP are reset to zero.
To clear the contents of WDT (including the WDT
prescaler), three methods are adopted; external reset (a
low level to RES), software instruction and a ²HALT² instruction. The software instruction includes ²CLR WDT²
and the other set - ²CLR WDT1² and ²CLR WDT2². Of
these two types of instruction, only one can be active depending upon the option - ²CLR WDT times selection
option². If the ²CLR WDT² is selected (i.e. CLRWDT
times equal one), any execution of the ²CLR WDT² instruction will clear the WDT. In the case that ²CLR
WDT1² and ²CLR WDT2² are chosen (i.e. CLRWDT
times equal two), these two instructions must be executed to clear the WDT; otherwise, the WDT may reset
the chip as a result of time-out.
The WDT clock source is implemented by a dedicated
RC oscillator (WDT oscillator), instruction clock (system
clock divided by 4), determine by options. This timer is
designed to prevent a software malfunction or sequence
from jumping to an unknown location with unpredictable
results. The Watchdog Timer can be disabled by options. If the Watchdog Timer is disabled, all the executions related to the WDT result in no operation.
Once the internal WDT oscillator (RC oscillator with a
period of 65ms at 5V normally) is selected, it is first divided by 256 (8-stage) to get the nominal time-out period of 16.6ms at 5V. This time-out period may vary with
temperatures, VDD and process variations. By making
use of the WDT prescaler, longer time-out periods can
be realized. Writing data to WS2, WS1, WS0 (bit 2,1,0 of
the WDTS) can give different time-out periods. If WS2,
WS1, and WS0 are all equal to 1, the division ratio is up
to 1:128, and the maximum time-out period is 2.1s at 5V
seconds. If the WDT oscillator is disabled, the WDT
clock may still come from the instruction clock and operates in the same manner except that in the HALT state
the WDT may stop counting and lose its protecting purpose. In this situation the logic can only be restarted by
external logic. The high nibble and bit 3 of the WDTS are
reserved for user-defined flags, which can be used to indicate some specified status.
Power Down Operation - HALT
The HALT mode is initialized by a ²HALT² instruction
and results in the following...
· The system oscillator will be turned off but the WDT
oscillator remains running (if the WDT oscillator is selected).
· The contents of the on chip RAM and registers remain
unchanged.
If the device operates in a noisy environment, using the
on-chip RC oscillator (WDT OSC) is strongly recommended, since the HALT will stop the system clock.
WS2
WS1
WS0
Division Ratio
0
0
0
1:1
0
0
1
1:2
0
1
0
1:4
0
1
1
1:8
1
0
0
1:16
1
0
1
1:32
1
1
0
1:64
1
1
1
1:128
· WDT and WDT prescaler will be cleared and re-
counted again (if the WDT clock is from the WDT oscillator).
· All of the I/O ports maintain their original status.
· The PDF flag is set and the TO flag is cleared.
The system can leave the HALT mode by means of an
external reset, an interrupt, an external falling edge signal on port A or a WDT overflow. An external reset
causes a device initialization and the WDT overflow performs a ²warm reset². After the TO and PDF flags are
examined, the reason for chip reset can be determined.
The PDF flag is cleared by system power-up or executing the ²CLR WDT² instruction and is set when executing the ²HALT² instruction. The TO flag is set if the WDT
time-out occurs, and causes a wake-up that only resets
WDTS (09H) Register
S y s te m
C lo c k /4
W D T P r e s c a le r
O p tio n
S e le c t
8 - b it C o u n te r
W D T
O S C
7 - b it C o u n te r
8 -to -1 M U X
W S 0 ~ W S 2
W D T T im e - o u t
Watchdog Timer
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HT48F70E
the Program Counter and Stack Pointer; the others remain in their original status.
tem reset (power-up, WDT time-out or RES reset) or the
system awakes from the HALT state.
The port A wake-up and interrupt methods can be considered as a continuation of normal execution. Each bit
in port A can be independently selected to wake-up the
device by options. Awakening from an I/O port stimulus,
the program will resume execution of the next instruction. If it awakens from an interrupt, two sequence may
occur. If the related interrupt is disabled or the interrupt
is enabled but the stack is full, the program will resume
execution at the next instruction. If the interrupt is enabled and the stack is not full, the regular interrupt response takes place. If an interrupt request flag is set to
²1² before entering the HALT mode, the wake-up function of the related interrupt will be disabled. Once a
wake-up event occurs, it takes 1024 tSYS (system clock
period) to resume normal operation. In other words, a
dummy period will be inserted after a wake-up. If the
wake-up results from an interrupt acknowledge signal,
the actual interrupt subroutine execution will be delayed
by one or more cycles. If the wake-up results in the next
instruction execution, this will be executed immediately
after the dummy period is finished.
When a system reset occurs, the SST delay is added
during the reset period. Any wake-up from HALT will enable the SST delay.
An extra option load time delay is added during system
reset (power-up, WDT time-out at normal mode or RES
reset).
The functional unit chip reset status are shown below.
Program Counter
000H
Interrupt
Disable
Prescaler
Clear
WDT
Clear. After master
reset, WDT begins
counting
Timer/Event Counter
Off
Input/Output Ports
Input mode
Stack Pointer
Points to the top of
the stack
V D D
R E S
To minimize power consumption, all the I/O pins should
be carefully managed before entering the HALT status.
tS
S T
S S T T im e - o u t
C h ip
Reset
R e s e t
Reset Timing Chart
There are three ways in which a reset can occur:
· RES reset during normal operation
V
· RES reset during HALT
· WDT time-out reset during normal operation
0 .0 1 m F *
The WDT time-out reset during HALT mode is different
from other chip reset conditions, since it can perform a
²warm reset² that resets only the Program Counter and
Stack Pointer, leaving the other circuits in their original
state. Some registers remain unchanged during other
reset conditions. Most registers are reset to the ²initial
condition² when the reset conditions are met. By examining the PDF and TO flags, the program can distinguish between different ²chip resets².
TO PDF
1 0 0 k W
R E S
1 0 k W
0 .1 m F *
Reset Circuit
Note:
RESET Conditions
0
0
RES reset during power-on
u
u
RES reset during normal operation
0
1
RES wake-up from HALT mode
1
u
WDT time-out reset during normal operation
1
1
WDT wake-up from HALT mode
D D
²*² Make the length of the wiring, which is connected to the RES pin as short as possible, to
avoid noise interference.
H A L T
W a rm
R e s e t
W D T
R E S
Note: ²u² stands for ²unchanged²
O S C 1
To guarantee that the system oscillator is started and
stabilized, the SST (System Start-up Timer) provides an
extra-delay of 1024 system clock pulses when the sys-
S S T
1 0 - b it R ip p le
C o u n te r
S y s te m
C o ld
R e s e t
R e s e t
Reset Configuration
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HT48F70E
The states of the registers is summarized in the table.
Register
MP0
Reset
(Power On)
WDT Time-out
RES Reset
(Normal Operation) (Normal Operation)
xxxx xxxx
uuuu uuuu
uuuu uuuu
RES Reset
(HALT)
WDT Time-out
(HALT)*
uuuu uuuu
uuuu uuuu
MP1
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
BP
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
ACC
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
000H
000H
000H
000H
000H
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
Program
Counter
TBLP
TBLH
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
WDTS
0000 0111
0000 0111
0000 0111
0000 0111
uuuu uuuu
STATUS
--00 xxxx
--1u uuuu
--uu uuuu
--01 uuuu
--11 uuuu
INTC
-000 0000
-000 0000
-000 0000
-000 0000
-uuu uuuu
TMR0H
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
uuuu uuuu
TMR0L
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
uuuu uuuu
TMR0C
00-0 1---
00-0 1---
00-0 1---
00-0 1---
uu-u u---
TMR1H
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
uuuu uuuu
TMR1L
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
uuuu uuuu
TMR1C
00-0 1---
00-0 1---
00-0 1---
00-0 1---
uu-u u---
PA
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PAC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PB
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PBC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PCC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PD
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PDC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PE
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PEC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PF
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PFC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PG
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PGC
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
1000 ----
1000 ----
1000 ----
1000 ----
uuuu ----
EECR
Note:
²*² stands for ²warm reset²
²u² stands for ²unchanged²
²x² stands for ²unknown²
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HT48F70E
Timer/Event Counter
nal lower-order byte buffer (8 bits) and writing TMR0H
will transfer the specified data and the contents of the
lower-order byte buffer to TMR0H and TMR0L preload
registers, respectively. The Timer/Event Counter 1
preload register is changed by each writing TMR0H operations. Reading TMR0H will latch the contents of
TMR0H and TMR0L counters to the destination and the
lower-order byte buffer, respectively. Reading the
TMR0L will read the contents of the lower-order byte
buffer. The TMR0C is the Timer/Event Counter 1 control
register, which defines the operating mode, counting enable or disable and active edge.
Two timer/event counters (TMR0, TMR1) are implemented in the microcontroller. The Timer/Event Counter
0 contains a 16-bit programmable count-up counter and
the clock may come from an external source or from the
system clock divided by 4. The Timer/Event Counter 1
contains a 16-bit programmable count-up counter and
the clock may come from an external source or from the
system clock divided by 4.
Using the external clock input allows the user to count external events, measure time intervals or pulse widths, or
generate an accurate time base. While using the internal
clock allows the user to generate an accurate time base.
There are 3 registers related to the Timer/Event Counter
1; TMR1H (0FH), TMR1L (10H), TMR1C (11H). Writing
TMR1L will only put the written data to an internal
lower-order byte buffer (8 bits) and writing TMR1H will
transfer the specified data and the contents of the
There are 3 registers related to the Timer/Event Counter
0;TMR0H ([0CH]), TMR0L ([0DH]), TMR0C ([0EH]).
Writing TMR0L will only put the written data to an interBit No.
Label
0~2
¾
Function
Unused bit, read as ²0²
3
T0E
Defines the TMR0 active edge of the timer/event counter:
In Event Counter Mode (T0M1,T0M0)=(0,1):
1:count on falling edge;
0:count on rising edge
In Pulse Width measurement mode (T0M1,T0M0)=(1,1):
1: start counting on the rising edge, stop on the falling edge;
0: start counting on the falling edge, stop on the rising edge
4
T0ON
Enable or disable timer 0 counting (0=disabled; 1=enabled)
5
¾
6
7
T0M0
T0M1
Unused bit, read as ²0²
Defines the operating mode (T0M1, T0M0)
01=Event count mode (external clock)
10=Timer mode (internal clock)
11=Pulse width measurement mode
00=Unused
TMR0C (0EH) Register
Bit No.
Label
0~2
¾
Function
Unused bit, read as ²0²
3
T1E
Defines the TMR1 active edge of the timer/event counter:
In Event Counter Mode (T1M1,T1M0)=(0,1):
1:count on falling edge;
0:count on rising edge
In Pulse Width measurement mode (T1M1,T1M0)=(1,1):
1: start counting on the rising edge, stop on the falling edge;
0: start counting on the falling edge, stop on the rising edge
4
T1ON
Enable or disable timer 1 counting (0=disabled; 1=enabled)
5
¾
6
7
T1M0
T1M1
Unused bit, read as ²0²
Defines the operating mode (T1M1, T1M0)
01=Event count mode (external clock)
10=Timer mode (internal clock)
11=Pulse width measurement mode
00=Unused
TMR1C (11H) Register
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HT48F70E
(or high to low if the TE bits is ²0²) it will start counting
until the TMR0/TMR1 returns to the original level and resets the T0ON/T1ON. The measured result will remain
in the Timer/Event Counter 0/1 even if the activated
transient occurs again. In other words, only one cycle
measurement can be done. Until setting the
T0ON/T1ON, the cycle measurement will function again
as long as it receives further transient pulse. Note that,
in this operating mode, the Timer/Event Counter 0/1
starts counting not according to the logic level but according to the transient edges. In the case of counter
overflows, the counter 0/1 is reloaded from the
Timer/Event Counter 0/1 preload register and issues the
interrupt request just like the other two modes. To enable the counting operation, the timer ON bit
(T0ON/T1ON; bit 4 of TMR0C/TMR1C) should be set to
1. In the pulse width measurement mode, the
T0ON/T1ON will be cleared automatically after the measurement cycle is completed. But in the other two
modes the T0ON/T1ON can only be reset by instructions. The overflow of the Timer/Event Counter 0/1 is
one of the wake-up sources. No matter what the operation mode is, writing a 0 to ET0I/ET1I can disable the
corresponding interrupt services.
lower-order byte buffer to TMR1H and TMR1L preload
registers respectively. The Timer/Event Counter 1
preload register is changed by each writing TMR1H operations. Reading TMR1H will latch the contents of
TMR1H and TMR1L counters to the destination and the
lower-order byte buffer, respectively. Reading the
TMR1L will read the contents of the lower-order byte
buffer. The TMR1C is the Timer/Event Counter 1 control
register, which defines the operating mode, counting enable or disable and active edge.
The T0M0, T0M1, T1M0, T1M1 bits define the operating
mode. The event count mode is used to count external
events, which means the clock source comes from an
external (TMR0/TMR1) pin. The timer mode functions
as a normal timer with the clock source coming from the
instruction clock (Timer1). The pulse width measurement mode can be used to count the high or low level
duration of the external signal (TMR0/TMR1). The
counting is based on the instruction clock (Timer1).
In the event count or timer mode, once the Timer/Event
Counter 0/1 starts counting, it will count from the current
contents in the Timer/Event Counter 0/1 to FFFFH.
Once overflow occurs, the counter is reloaded from the
Timer/Event Counter 0/1 preload register and generates
the interrupt request flag (T0F/T1F; bit 5/6 of INTC) at
the same time.
In the case of Timer/Event Counter 0/1 OFF condition,
writing data to the Timer/Event Counter 0/1 preload
register will also reload that data to the Timer/Event
Counter 0/1. But if the Timer/Event Counter 0/1 is turned
on, data written to it will only be kept in the Timer/Event
Counter 0/1 preload register. The Timer/Event Counter
In the pulse width measurement mode with the
T0ON/T1ON and T0E/T1E bits equal to one, once the
TMR0/TMR1 has received a transient from low to high
D a ta B u s
fS
Y S /4
T 0 M 1
T 0 M 0
T M R 0
1 6 B its
T im e r /E v e n t C o u n te r
P r e lo a d R e g is te r
L o w B y te
B u ffe r
R e lo a d
T 0 E
P u ls e W id th
M e a s u re m e n t
M o d e C o n tro l
T 0 M 1
T 0 M 0
T 0 O N
1 6 B its
T im e r /E v e n t C o u n te r
(T M R 0 H /T M R 0 L )
O v e r flo w
to In te rru p t
1 /2
B Z
B Z
Timer/Event Counter 0
D a ta B u s
fS
Y S /4
T 1 M 1
T 1 M 0
T M R 1
1 6 B its
T im e r /E v e n t C o u n te r
P r e lo a d R e g is te r
R e lo a d
T 1 E
T 1 M 1
T 1 M 0
T 1 O N
L o w B y te
B u ffe r
P u ls e W id th
M e a s u re m e n t
M o d e C o n tro l
1 6 B its
T im e r /E v e n t C o u n te r
(T M R 1 H /T M R 1 L )
1 /2
O v e r flo w
to In te rru p t
B Z
B Z
Timer/Event Counter 1
Rev. 1.00
15
January 9, 2007
HT48F70E
0/1 will still operate until overflow occurs (a Timer/Event
Counter 0/1 reloading will occur at the same time). When
the Timer/Event Counter 0/1 (reading TMR0/TMR1) is
read, the clock will be blocked to avoid errors. As clock
blocking may result in a counting error, this must be
taken into consideration by the programmer.
the control register bit is ²0², the contents of the latches
will move to the internal bus. The latter is possible in the
²read-modify-write² instruction.
Input/Output Ports
After a chip reset, these input/output lines remain at high
levels or floating state (depending on the pull-high options). Each bit of these input/output latches can be set
or cleared by ²SET [m].i² and ²CLR [m].i² (m=12H, 14H,
16H, 18H, 1AH, 1CH or 1EH) instructions.
For output function, CMOS is the only configuration.
These control registers are mapped to locations 13H,
15H, 17H, 19H, 1BH, 1DH and 1FH.
There are 56 bidirectional input/output lines in the
microcontroller, labeled from PA to PG, which are
mapped to the data memory of [12H], [14H], [16H],
[18H], [1AH], [1CH] and [1EH] respectively. All of these
I/O ports can be used for input and output operations.
For input operation, these ports are non-latching, that is,
the inputs must be ready at the T2 rising edge of
instruction ²MOV A,[m]² (m=12H, 14H, 16H, 18H, 1AH,
1CH or 1EH). For output operation, all the data is
latched and remains unchanged until the output latch is
rewritten.
Some instructions first input data and then follow the
output operations. For example, ²SET [m].i², ²CLR
[m].i², ²CPL [m]², ²CPLA [m]² read the entire port states
into the CPU, execute the defined operations
(bit-operation), and then write the results back to the
latches or the accumulator.
Each line of port A has the capability of waking-up the
device.
Each I/O line has its own control register (PAC, PBC,
PCC, PDC, PEC, PFC, PGC) to control the input/output
configuration. With this control register, CMOS output or
Schmitt trigger input with or without pull-high resistor
structures can be reconfigured dynamically under software control. To function as an input, the corresponding
latch of the control register must write a ²1². The input
source also depends on the control register. If the control register bit is ²1², the input will read the pad state. If
There is a pull-high option available for all I/O lines (port
option). Once the pull-high option of an I/O line is selected, the I/O line has a pull-high resistor. Otherwise,
the pull-high resistor is absent. It should be noted that a
non-pull-high I/O line operating in input mode will cause
a floating state.
V
D a ta B u s
W r ite C o n tr o l R e g is te r
C o n tr o l B it
Q
D
Q
C K
S
P A 0
P B 0
P C 0
P D 0
P E 0
P F 0
P G 0
C h ip R e s e t
R e a d C o n tr o l R e g is te r
W r ite D a ta R e g is te r
D a ta B it
Q
D
C K
S
~ P A
~ P B
~ P C
~ P D
~ P E
~ P F
~ P G
7
7
7
7
7
7
7
Q
M
R e a d D a ta R e g is te r
D D
P u ll- h ig h
O p tio n
U
X
S y s te m W a k e -u p
( P A o n ly )
O P 0 ~ O P 7
Input/Output Ports
Rev. 1.00
16
January 9, 2007
HT48F70E
Low Voltage Reset - LVR
The relationship between VDD and VLVR is shown below.
The microcontroller provides a low voltage reset circuit
in order to monitor the supply voltage of the device. If the
supply voltage of the device drops to within the range of
0.9V~VLVR, such as when changing a battery, the LVR
will automatically reset the device internally.
V D D
5 .5 V
O P R
5 .5 V
V
The LVR includes the following specifications:
L V R
3 .3 V
2 .4 V
· The low voltage (0.9V~VLVR) has to remain in its orig-
inal state for longer than 1ms. If the low voltage state
does not exceed 1ms, the LVR will ignore it and will
not perform a reset function.
0 .9 V
Note:
· The LVR uses an ²OR² function with the external RES
signal to perform a chip reset.
V
V
VOIR is the voltage range for proper chip operation at 4MHz system clock.
D D
5 .5 V
V
L V R
L V R
D e te c t V o lta g e
0 .9 V
0 V
R e s e t S ig n a l
N o r m a l O p e r a tio n
R e s e t
R e s e t
*1
*2
Low Voltage Reset
Note:
*1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
clock pulses before starting the normal operation.
*2: Since low voltage state has to be maintained its original state for longer than 1ms, therefore after 1ms delay,
the device enters the reset mode.
EEPROM Data Memory
The 256´8 bits EEPROM data memory is readable and writable during normal operation. It is indirectly addressed
through the control register EECR ([40H] in Bank 1). The EECR can be read and written to only by indirect addressing
mode using MP1.
Bit No.
Label
Function
0~3
¾
Unused bit, read as ²0²
4
CS
EEPROM data memory select
5
SK
Serial clock input to EEPROM data memory
6
DI
Serial data input to EEPROM data memory
7
DO
Serial data output from EEPROM data memory
EECR (40H) Register
Rev. 1.00
17
January 9, 2007
HT48F70E
C S
S K
C S
S K
E E C R
C o n tro l
L o g ic
a n d
C lo c k
G e n e ra to r
A d d r e s s R e g is te r
A d d re s s D e c o d e r
D I
D O
V
D D
D I
M e m o r y C e ll A r r a y
2 K : (2 5 6 ´ 8 )
D a ta
R e g is te r
O u tp u t B u ffe r
D O
S a m e a s H T 9 3 L C 5 6
EEPROM Data Memory Block Diagram
; instructions.
The EEPROM data memory is accessed via a
three-wire serial communication interface by writing to
EECR. It is arranged into 256 words by 8 bits. The
EEPROM data memory contains seven instructions:
READ, ERASE, WRITE, EWEN, EWDS, ERAL and
WRAL. These instructions are all made up of 12 bits
data: 1 start bit, 2 op-code bits and 9 address bits.
mov
A, FFh
mov
EEADDR, A
mov
A, 55h
mov
EEDATA, A
call
WRITE
; subroutine to run WRITE
; instructions. (write 55h data to
Before accessing the EEPROM, an initial procedure
should be executed. The following procedures show the
detail procedures step by step.
; address FFh.)
call
EWDS
; subroutine to run EWDS
; Instructions.
· Execute the EWEN instruction.
; (This one is optional)
· Execute the WRITE instruction. (The application pro-
grams need to reserve one location for this procedure.
The content of it will be changed after this procedure.)
· Execute the EWDS instruction. (This one is optional. If
you don¢t want to write data to EEPROM immediately,
then disable it to prevent the mis-programming. )
By writing CS, SK and DI, these instructions can be
given to the EEPROM. These serial instruction data presented at the DI will be written into the EEPROM data
memory at the rising edge of SK. During the READ cycle, DO acts as the data output and during the WRITE or
ERASE cycle, DO indicates the BUSY/READY status.
When the DO is active for read data or as a BUSY/
READY indicator the CS pin must be high; otherwise DO
will be in a high state. For successful instructions, CS
must be low after the instruction is sent. After power-on,
the device is by default in the EWDS state. An EWEN instruction must be performed before any ERASE or
WRITE instruction can be executed.
The following is an assembly program example. User
can put them into the POR program. (Note: Please refer
to the application note for the detail of the EWEN,
EWDS and WRITE subroutines.)
mov
A,01h
mov
BP,A
mov
A,40h
mov
MP1,A
; set MP1 to EECR address
call
EWEN
; subroutine to run EWEN
; set to bank 1
The following are the functional descriptions and timing diagrams of all seven instructions.
C S
tC
S S
tC
tS
S K
D I
D O
Rev. 1.00
tD
IS
tS
K H
K L
tC
t D IH
V a lid D a ta
tP
D S
S H
V a lid D a ta
tP
D 0
D 1
1
18
January 9, 2007
HT48F70E
EECR A.C. Characteristics
Symbol
Parameter
Ta=25°C
VCC=5V±10%
VCC=2.2V±10%
Unit
Min.
Max.
Min.
Max.
0
2
0
1
MHz
fSK
Clock Frequency
tSKH
SK High Time
250
¾
500
¾
ns
tSKL
SK Low Time
250
¾
500
¾
ns
tCSS
CS Setup Time
50
¾
100
¾
ns
tCSH
CS Hold Time
0
¾
0
¾
ns
tCDS
CS Deselect Time
250
¾
250
¾
ns
tDIS
DI Setup Time
100
¾
200
¾
ns
tDIH
DI Hold Time
100
¾
200
¾
ns
tPD1
DO Delay to ²1²
¾
250
¾
500
ns
tPD0
DO Delay to ²0²
¾
250
¾
500
ns
tSV
Status Valid Time
¾
250
¾
250
ns
tHZ
DO Disable Time
100
¾
200
¾
ns
tPR1
Write Cycle Time Per Word 1
¾
2
¾
5
ms
tPR2
Write Cycle Time Per Word 2
¾
10
¾
10
ms
READ
ERASE
The READ instruction will stream out data at a specified
address on the DO. The data on DO changes during the
low-to-high edge of SK. The 8 bits data stream is preceded by a logical ²0² dummy bit. Irrespective of the
condition of the EWEN or EWDS instruction, the READ
command is always valid and independent of these two
instructions. After the data word has been read the internal address will be automatically incremented by 1, allowing the next consecutive data word to be read out
without entering further address data. The address will
wrap around with CS High until CS returns to Low.
The ERASE instruction erases data at the specified addresses in the programming enable mode. After the
ERASE op-code and the specified address have been
issued, the data erase is activated by the falling edge of
CS. Since the internal auto-timing generator provides all
timing signals for the internal erase, so the SK clock is
not required. During the internal erase, we can verify the
busy/ready status if CS is high. The DO will remain low
but when the operation is over, the DO will return to high
and further instructions can be executed.
WRITE
EWEN/EWDS
The WRITE instruction writes data into the EEPROM
data memory at the specified addresses in the programming enable mode. After the WRITE op-code and the
specified address and data have been issued, the data
writing is activated by the falling edge of CS. Since the
internal auto-timing generator provides all timing signal
for the internal writing, so the SK clock is not required.
The auto-timing write cycle includes an automatic
erase-before-write capability. So, it is not necessary to
erase data before the WRITE instruction. During the internal writing, we can verify the busy/ready status if CS
is high. The DO will remain low but when the operation is
over, the DO will return to high and further instructions
can be executed.
The EWEN/EWDS instruction will enable or disable the
programming capabilities. At both the power on and
power off state the device automatically enters the disable
mode. Before a WRITE, ERASE, WRAL or ERAL instruction is given, the programming enable instruction EWEN
must be issued, otherwise the ERASE/WRITE instruction
is invalid. After the EWEN instruction is issued, the programming enable condition remains until power is turned
off or an EWDS instruction is issued. No data can be written into the EEPROM data memory in the programming
disabled state. By so doing, the internal memory data can
be protected.
Rev. 1.00
19
January 9, 2007
HT48F70E
ERAL
WRAL
The ERAL instruction erases the entire 256´8 memory
cells to a logical ²1² state in the programming enable
mode. After the erase-all instruction set has been issued, the data erase feature is activated by a falling
edge of CS. Since the internal auto-timing generator
provides all timing signal for the erase-all operation, so
the SK clock is not required. During the internal erase-all
operation, we can verify the busy/ready status if CS is
high. The DO will remain low but when the operation is
over, the DO will return to high and further instruction
can be executed.
The WRAL instruction writes data into the entire 256´8
memory cells in the programming enable mode. After
the write-all instruction set has been issued, the data
writing is activated by a falling edge of CS. Since the internal auto-timing generator provides all timing signals
for the write-all operation, so the SK clock is not required. During the internal write-all operation, we can
verify the busy/ready status if CS is high. The DO will remain low but when the operation is over the DO will return to high and further instruction can be executed.
EECR Control Timing Diagrams
· READ
tC
D S
C S
S K
(1 ) 1
S ta r t b it
D I
0
A N
A 0
1
D O
0
D 0
D X
D X
1
*
(X 8 )
M o d e
* A d d r e s s p o in te r a u to m a tic a lly c y c le s to th e n e x t w o r d
A N
A 7
D X
D 7
· EWEN/EWDS
C S
S ta n d b y
S K
D I
0
(1 )
S ta r t b it
0
1 1 = E W E N
0 0 = E W D S
· WRITE
tC
C S
D S
V e r ify
S ta n d b y
S K
D I
(1 )
0
1
A N
A N -1 A N -2
A 1
A 0
D X
D 0
S ta r t b it
tS
1
B u s y
D O
tP
Rev. 1.00
20
V
R e a d y
R 1
January 9, 2007
HT48F70E
· ERASE
tC
C S
D S
V e r ify
S ta n d b y
S K
(1 )
D I
1
1
A N
A N -1 A N -2
A 1
A 0
S ta r t b it
tS
1
D O
B u s y
tP
V
R e a d y
R 1
· ERAL
tC
C S
D S
V e r ify
S ta n d b y
S K
0
(1 )
S ta r t b it
D I
0
1
0
tS
1
D O
V
B u s y
tP
R e a d y
R 2
· WRAL
tC
C S
D S
V e r ify
S ta n d b y
S K
0
(1 )
S ta r t b it
D I
D O
0
0
1
D X
D 0
tS
1
V
B u s y
tP
R e a d y
R 2
EEPROM Data Memory Instruction Set Summary
Start bit
Op Code
Address
Data
READ
Instruction
Read data
1
10
X, A7~A0
D7~D0
ERASE
Erase data
1
11
X, A7~A0
¾
WRITE
Write data
1
01
X, A7~A0
D7~D0
EWEN
Erase/Write Enable
1
00
11XXXXXXX
¾
EWDS
Erase/Write Disable
1
00
00XXXXXXX
¾
ERAL
Erase All
1
00
10XXXXXXX
¾
WRAL
Write All
1
00
01XXXXXXX
D7~D0
Note:
Comments
²X² stands for ²don¢t care²
Rev. 1.00
21
January 9, 2007
HT48F70E
Options
The following table shows all kinds of options in the microcontroller. All of the options must be defined to ensure a properly functioning system.
No.
Options
1
WDT clock source: WDT oscillator or fSYS/4 or disable
2
CLRWDT instructions: 1 or 2 instructions
3
PA wake-up (By bit)
4
PA CMOS or Schmitt input
5
PA, PB, PC, PD, PE, PF, PG pull-high enable or disable (By port)
6
BZ/BZ enable or disable
7
BZ/BZ source: TMR0 or TMR1
8
System oscillator: RC or crystal
9
WDT enable or disable
10
LVR enable or disable
Application Circuits
V
D D
0 .0 1 m F *
P A 0 ~ P A 7
V D D
P B 2 ~ P B 7
1 0 0 k W
P C 0 ~ P C 7
0 .1 m F
R E S
P D 0 ~ P D 7
1 0 k W
P E 0 ~ P E 7
0 .1 m F *
P F 0 ~ P F 7
V S S
O S C
C ir c u it
V
R
P B 0 /B Z
O S C 2
P B 1 /B Z
S e e R ig h t S id e
O S C 1
R C S y s te m O s c illa to r
2 4 k W < R O S C < 1 M W
O S C 2
N M O S o p e n d r a in
C 1
O S C 1
C 2
T M R 0
R 1
T M R 1
IN T
O S C
4 7 0 p F
P G 0 ~ P G 7
O S C 1
D D
H T 4 8 F 7 0 E
O S C 2
O S C
C ry s ta l S y s te m
F o r th e v a lu e s ,
s e e ta b le b e lo w
O s c illa to r
C ir c u it
The following table shows the C1, C2 and R1 values corresponding to the different crystal values. (For reference only)
Crystal or Resonator
C1, C2
R1
4MHz Crystal
0pF
10kW
4MHz Resonator
10pF
12kW
3.58MHz Crystal
0pF
10kW
3.58MHz Resonator
25pF
10kW
2MHz Crystal & Resonator
25pF
10kW
1MHz Crystal
35pF
27kW
480kHz Resonator
300pF
9.1kW
455kHz Resonator
300pF
10kW
429kHz Resonator
300pF
10kW
The function of the resistor R1 is to ensure that the oscillator will switch off should low voltage conditions occur.
Such a low voltage, as mentioned here, is one which is less than the lowest value of the MCU operating voltage. Note however that if the LVR is enabled then R1 can be removed.
Note:
The resistance and capacitance for reset circuit should be designed in such a way as to ensure that the VDD is
stable and remains within a valid operating voltage range before bringing RES high.
²*² Make the length of the wiring, which is connected to the RES pin as short as possible, to avoid noise
interference.
Rev. 1.00
22
January 9, 2007
HT48F70E
Instruction Set Summary
Description
Instruction
Cycle
Flag
Affected
Add data memory to ACC
Add ACC to data memory
Add immediate data to ACC
Add data memory to ACC with carry
Add ACC to data memory with carry
Subtract immediate data from ACC
Subtract data memory from ACC
Subtract data memory from ACC with result in data memory
Subtract data memory from ACC with carry
Subtract data memory from ACC with carry and result in data memory
Decimal adjust ACC for addition with result in data memory
1
1(1)
1
1
1(1)
1
1
1(1)
1
1(1)
1(1)
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
Z,C,AC,OV
C
1
1
1
1(1)
1(1)
1(1)
1
1
1
1(1)
1
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Increment data memory with result in ACC
Increment data memory
Decrement data memory with result in ACC
Decrement data memory
1
1(1)
1
1(1)
Z
Z
Z
Z
Rotate data memory right with result in ACC
Rotate data memory right
Rotate data memory right through carry with result in ACC
Rotate data memory right through carry
Rotate data memory left with result in ACC
Rotate data memory left
Rotate data memory left through carry with result in ACC
Rotate data memory left through carry
1
1(1)
1
1(1)
1
1(1)
1
1(1)
None
None
C
C
None
None
C
C
Move data memory to ACC
Move ACC to data memory
Move immediate data to ACC
1
1(1)
1
None
None
None
Clear bit of data memory
Set bit of data memory
1(1)
1(1)
None
None
Mnemonic
Arithmetic
ADD A,[m]
ADDM A,[m]
ADD A,x
ADC A,[m]
ADCM A,[m]
SUB A,x
SUB A,[m]
SUBM A,[m]
SBC A,[m]
SBCM A,[m]
DAA [m]
Logic Operation
AND A,[m]
OR A,[m]
XOR A,[m]
ANDM A,[m]
ORM A,[m]
XORM A,[m]
AND A,x
OR A,x
XOR A,x
CPL [m]
CPLA [m]
AND data memory to ACC
OR data memory to ACC
Exclusive-OR data memory to ACC
AND ACC to data memory
OR ACC to data memory
Exclusive-OR ACC to data memory
AND immediate data to ACC
OR immediate data to ACC
Exclusive-OR immediate data to ACC
Complement data memory
Complement data memory with result in ACC
Increment & Decrement
INCA [m]
INC [m]
DECA [m]
DEC [m]
Rotate
RRA [m]
RR [m]
RRCA [m]
RRC [m]
RLA [m]
RL [m]
RLCA [m]
RLC [m]
Data Move
MOV A,[m]
MOV [m],A
MOV A,x
Bit Operation
CLR [m].i
SET [m].i
Rev. 1.00
23
January 9, 2007
HT48F70E
Instruction
Cycle
Flag
Affected
Jump unconditionally
Skip if data memory is zero
Skip if data memory is zero with data movement to ACC
Skip if bit i of data memory is zero
Skip if bit i of data memory is not zero
Skip if increment data memory is zero
Skip if decrement data memory is zero
Skip if increment data memory is zero with result in ACC
Skip if decrement data memory is zero with result in ACC
Subroutine call
Return from subroutine
Return from subroutine and load immediate data to ACC
Return from interrupt
2
1(2)
1(2)
1(2)
1(2)
1(3)
1(3)
1(2)
1(2)
2
2
2
2
None
None
None
None
None
None
None
None
None
None
None
None
None
Read ROM code (current page) to data memory and TBLH
Read ROM code (last page) to data memory and TBLH
2(1)
2(1)
None
None
No operation
Clear data memory
Set data memory
Clear Watchdog Timer
Pre-clear Watchdog Timer
Pre-clear Watchdog Timer
Swap nibbles of data memory
Swap nibbles of data memory with result in ACC
Enter power down mode
1
1(1)
1(1)
1
1
1
1(1)
1
1
None
None
None
TO,PDF
TO(4),PDF(4)
TO(4),PDF(4)
None
None
TO,PDF
Mnemonic
Description
Branch
JMP addr
SZ [m]
SZA [m]
SZ [m].i
SNZ [m].i
SIZ [m]
SDZ [m]
SIZA [m]
SDZA [m]
CALL addr
RET
RET A,x
RETI
Table Read
TABRDC [m]
TABRDL [m]
Miscellaneous
NOP
CLR [m]
SET [m]
CLR WDT
CLR WDT1
CLR WDT2
SWAP [m]
SWAPA [m]
HALT
Note:
x: Immediate data
m: Data memory address
A: Accumulator
i: 0~7 number of bits
addr: Program memory address
Ö: Flag is affected
-: Flag is not affected
(1)
: If a loading to the PCL register occurs, the execution cycle of instructions will be delayed for one more cycle
(four system clocks).
(2)
: If a skipping to the next instruction occurs, the execution cycle of instructions will be delayed for one more
cycle (four system clocks). Otherwise the original instruction cycle is unchanged.
(3) (1)
:
(4)
Rev. 1.00
and (2)
: The flags may be affected by the execution status. If the Watchdog Timer is cleared by executing the
²CLR WDT1² or ²CLR WDT2² instruction, the TO and PDF are cleared.
Otherwise the TO and PDF flags remain unchanged.
24
January 9, 2007
HT48F70E
Instruction Definition
ADC A,[m]
Add data memory and carry to the accumulator
Description
The contents of the specified data memory, accumulator and the carry flag are added simultaneously, leaving the result in the accumulator.
Operation
ACC ¬ ACC+[m]+C
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
ADCM A,[m]
Add the accumulator and carry to data memory
Description
The contents of the specified data memory, accumulator and the carry flag are added simultaneously, leaving the result in the specified data memory.
Operation
[m] ¬ ACC+[m]+C
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
ADD A,[m]
Add data memory to the accumulator
Description
The contents of the specified data memory and the accumulator are added. The result is
stored in the accumulator.
Operation
ACC ¬ ACC+[m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
ADD A,x
Add immediate data to the accumulator
Description
The contents of the accumulator and the specified data are added, leaving the result in the
accumulator.
Operation
ACC ¬ ACC+x
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
ADDM A,[m]
Add the accumulator to the data memory
Description
The contents of the specified data memory and the accumulator are added. The result is
stored in the data memory.
Operation
[m] ¬ ACC+[m]
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
25
January 9, 2007
HT48F70E
AND A,[m]
Logical AND accumulator with data memory
Description
Data in the accumulator and the specified data memory perform a bitwise logical_AND operation. The result is stored in the accumulator.
Operation
ACC ¬ ACC ²AND² [m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
AND A,x
Logical AND immediate data to the accumulator
Description
Data in the accumulator and the specified data perform a bitwise logical_AND operation.
The result is stored in the accumulator.
Operation
ACC ¬ ACC ²AND² x
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
ANDM A,[m]
Logical AND data memory with the accumulator
Description
Data in the specified data memory and the accumulator perform a bitwise logical_AND operation. The result is stored in the data memory.
Operation
[m] ¬ ACC ²AND² [m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
CALL addr
Subroutine call
Description
The instruction unconditionally calls a subroutine located at the indicated address. The
program counter increments once to obtain the address of the next instruction, and pushes
this onto the stack. The indicated address is then loaded. Program execution continues
with the instruction at this address.
Operation
Stack ¬ Program Counter+1
Program Counter ¬ addr
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
CLR [m]
Clear data memory
Description
The contents of the specified data memory are cleared to 0.
Operation
[m] ¬ 00H
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
26
January 9, 2007
HT48F70E
CLR [m].i
Clear bit of data memory
Description
The bit i of the specified data memory is cleared to 0.
Operation
[m].i ¬ 0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
CLR WDT
Clear Watchdog Timer
Description
The WDT is cleared (clears the WDT). The power down bit (PDF) and time-out bit (TO) are
cleared.
Operation
WDT ¬ 00H
PDF and TO ¬ 0
Affected flag(s)
TO
PDF
OV
Z
AC
C
0
0
¾
¾
¾
¾
CLR WDT1
Preclear Watchdog Timer
Description
Together with CLR WDT2, clears the WDT. PDF and TO are also cleared. Only execution
of this instruction without the other preclear instruction just sets the indicated flag which implies this instruction has been executed and the TO and PDF flags remain unchanged.
Operation
WDT ¬ 00H*
PDF and TO ¬ 0*
Affected flag(s)
TO
PDF
OV
Z
AC
C
0*
0*
¾
¾
¾
¾
CLR WDT2
Preclear Watchdog Timer
Description
Together with CLR WDT1, clears the WDT. PDF and TO are also cleared. Only execution
of this instruction without the other preclear instruction, sets the indicated flag which implies this instruction has been executed and the TO and PDF flags remain unchanged.
Operation
WDT ¬ 00H*
PDF and TO ¬ 0*
Affected flag(s)
TO
PDF
OV
Z
AC
C
0*
0*
¾
¾
¾
¾
CPL [m]
Complement data memory
Description
Each bit of the specified data memory is logically complemented (1¢s complement). Bits
which previously contained a 1 are changed to 0 and vice-versa.
Operation
[m] ¬ [m]
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
27
January 9, 2007
HT48F70E
CPLA [m]
Complement data memory and place result in the accumulator
Description
Each bit of the specified data memory is logically complemented (1¢s complement). Bits
which previously contained a 1 are changed to 0 and vice-versa. The complemented result
is stored in the accumulator and the contents of the data memory remain unchanged.
Operation
ACC ¬ [m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
DAA [m]
Decimal-Adjust accumulator for addition
Description
The accumulator value is adjusted to the BCD (Binary Coded Decimal) code. The accumulator is divided into two nibbles. Each nibble is adjusted to the BCD code and an internal
carry (AC1) will be done if the low nibble of the accumulator is greater than 9. The BCD adjustment is done by adding 6 to the original value if the original value is greater than 9 or a
carry (AC or C) is set; otherwise the original value remains unchanged. The result is stored
in the data memory and only the carry flag (C) may be affected.
Operation
If ACC.3~ACC.0 >9 or AC=1
then [m].3~[m].0 ¬ (ACC.3~ACC.0)+6, AC1=AC
else [m].3~[m].0 ¬ (ACC.3~ACC.0), AC1=0
and
If ACC.7~ACC.4+AC1 >9 or C=1
then [m].7~[m].4 ¬ ACC.7~ACC.4+6+AC1,C=1
else [m].7~[m].4 ¬ ACC.7~ACC.4+AC1,C=C
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
Ö
DEC [m]
Decrement data memory
Description
Data in the specified data memory is decremented by 1.
Operation
[m] ¬ [m]-1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
DECA [m]
Decrement data memory and place result in the accumulator
Description
Data in the specified data memory is decremented by 1, leaving the result in the accumulator. The contents of the data memory remain unchanged.
Operation
ACC ¬ [m]-1
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
28
January 9, 2007
HT48F70E
HALT
Enter power down mode
Description
This instruction stops program execution and turns off the system clock. The contents of
the RAM and registers are retained. The WDT and prescaler are cleared. The power down
bit (PDF) is set and the WDT time-out bit (TO) is cleared.
Operation
Program Counter ¬ Program Counter+1
PDF ¬ 1
TO ¬ 0
Affected flag(s)
TO
PDF
OV
Z
AC
C
0
1
¾
¾
¾
¾
INC [m]
Increment data memory
Description
Data in the specified data memory is incremented by 1
Operation
[m] ¬ [m]+1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
INCA [m]
Increment data memory and place result in the accumulator
Description
Data in the specified data memory is incremented by 1, leaving the result in the accumulator. The contents of the data memory remain unchanged.
Operation
ACC ¬ [m]+1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
JMP addr
Directly jump
Description
The program counter are replaced with the directly-specified address unconditionally, and
control is passed to this destination.
Operation
Program Counter ¬addr
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
MOV A,[m]
Move data memory to the accumulator
Description
The contents of the specified data memory are copied to the accumulator.
Operation
ACC ¬ [m]
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
29
January 9, 2007
HT48F70E
MOV A,x
Move immediate data to the accumulator
Description
The 8-bit data specified by the code is loaded into the accumulator.
Operation
ACC ¬ x
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
MOV [m],A
Move the accumulator to data memory
Description
The contents of the accumulator are copied to the specified data memory (one of the data
memories).
Operation
[m] ¬ACC
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
NOP
No operation
Description
No operation is performed. Execution continues with the next instruction.
Operation
Program Counter ¬ Program Counter+1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
OR A,[m]
Logical OR accumulator with data memory
Description
Data in the accumulator and the specified data memory (one of the data memories) perform a bitwise logical_OR operation. The result is stored in the accumulator.
Operation
ACC ¬ ACC ²OR² [m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
OR A,x
Logical OR immediate data to the accumulator
Description
Data in the accumulator and the specified data perform a bitwise logical_OR operation.
The result is stored in the accumulator.
Operation
ACC ¬ ACC ²OR² x
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
ORM A,[m]
Logical OR data memory with the accumulator
Description
Data in the data memory (one of the data memories) and the accumulator perform a
bitwise logical_OR operation. The result is stored in the data memory.
Operation
[m] ¬ACC ²OR² [m]
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
30
January 9, 2007
HT48F70E
RET
Return from subroutine
Description
The program counter is restored from the stack. This is a 2-cycle instruction.
Operation
Program Counter ¬ Stack
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
RET A,x
Return and place immediate data in the accumulator
Description
The program counter is restored from the stack and the accumulator loaded with the specified 8-bit immediate data.
Operation
Program Counter ¬ Stack
ACC ¬ x
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
RETI
Return from interrupt
Description
The program counter is restored from the stack, and interrupts are enabled by setting the
EMI bit. EMI is the enable master (global) interrupt bit.
Operation
Program Counter ¬ Stack
EMI ¬ 1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
RL [m]
Rotate data memory left
Description
The contents of the specified data memory are rotated 1 bit left with bit 7 rotated into bit 0.
Operation
[m].(i+1) ¬ [m].i; [m].i:bit i of the data memory (i=0~6)
[m].0 ¬ [m].7
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
RLA [m]
Rotate data memory left and place result in the accumulator
Description
Data in the specified data memory is rotated 1 bit left with bit 7 rotated into bit 0, leaving the
rotated result in the accumulator. The contents of the data memory remain unchanged.
Operation
ACC.(i+1) ¬ [m].i; [m].i:bit i of the data memory (i=0~6)
ACC.0 ¬ [m].7
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
31
January 9, 2007
HT48F70E
RLC [m]
Rotate data memory left through carry
Description
The contents of the specified data memory and the carry flag are rotated 1 bit left. Bit 7 replaces the carry bit; the original carry flag is rotated into the bit 0 position.
Operation
[m].(i+1) ¬ [m].i; [m].i:bit i of the data memory (i=0~6)
[m].0 ¬ C
C ¬ [m].7
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
Ö
RLCA [m]
Rotate left through carry and place result in the accumulator
Description
Data in the specified data memory and the carry flag are rotated 1 bit left. Bit 7 replaces the
carry bit and the original carry flag is rotated into bit 0 position. The rotated result is stored
in the accumulator but the contents of the data memory remain unchanged.
Operation
ACC.(i+1) ¬ [m].i; [m].i:bit i of the data memory (i=0~6)
ACC.0 ¬ C
C ¬ [m].7
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
Ö
RR [m]
Rotate data memory right
Description
The contents of the specified data memory are rotated 1 bit right with bit 0 rotated to bit 7.
Operation
[m].i ¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6)
[m].7 ¬ [m].0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
RRA [m]
Rotate right and place result in the accumulator
Description
Data in the specified data memory is rotated 1 bit right with bit 0 rotated into bit 7, leaving
the rotated result in the accumulator. The contents of the data memory remain unchanged.
Operation
ACC.(i) ¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6)
ACC.7 ¬ [m].0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
RRC [m]
Rotate data memory right through carry
Description
The contents of the specified data memory and the carry flag are together rotated 1 bit
right. Bit 0 replaces the carry bit; the original carry flag is rotated into the bit 7 position.
Operation
[m].i ¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6)
[m].7 ¬ C
C ¬ [m].0
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
Ö
32
January 9, 2007
HT48F70E
RRCA [m]
Rotate right through carry and place result in the accumulator
Description
Data of the specified data memory and the carry flag are rotated 1 bit right. Bit 0 replaces
the carry bit and the original carry flag is rotated into the bit 7 position. The rotated result is
stored in the accumulator. The contents of the data memory remain unchanged.
Operation
ACC.i ¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6)
ACC.7 ¬ C
C ¬ [m].0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
Ö
SBC A,[m]
Subtract data memory and carry from the accumulator
Description
The contents of the specified data memory and the complement of the carry flag are subtracted from the accumulator, leaving the result in the accumulator.
Operation
ACC ¬ ACC+[m]+C
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
SBCM A,[m]
Subtract data memory and carry from the accumulator
Description
The contents of the specified data memory and the complement of the carry flag are subtracted from the accumulator, leaving the result in the data memory.
Operation
[m] ¬ ACC+[m]+C
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
SDZ [m]
Skip if decrement data memory is 0
Description
The contents of the specified data memory are decremented by 1. If the result is 0, the next
instruction is skipped. If the result is 0, the following instruction, fetched during the current
instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Operation
Skip if ([m]-1)=0, [m] ¬ ([m]-1)
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SDZA [m]
Decrement data memory and place result in ACC, skip if 0
Description
The contents of the specified data memory are decremented by 1. If the result is 0, the next
instruction is skipped. The result is stored in the accumulator but the data memory remains
unchanged. If the result is 0, the following instruction, fetched during the current instruction
execution, is discarded and a dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Operation
Skip if ([m]-1)=0, ACC ¬ ([m]-1)
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
33
January 9, 2007
HT48F70E
SET [m]
Set data memory
Description
Each bit of the specified data memory is set to 1.
Operation
[m] ¬ FFH
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SET [m]. i
Set bit of data memory
Description
Bit i of the specified data memory is set to 1.
Operation
[m].i ¬ 1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SIZ [m]
Skip if increment data memory is 0
Description
The contents of the specified data memory are incremented by 1. If the result is 0, the following instruction, fetched during the current instruction execution, is discarded and a
dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed with
the next instruction (1 cycle).
Operation
Skip if ([m]+1)=0, [m] ¬ ([m]+1)
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SIZA [m]
Increment data memory and place result in ACC, skip if 0
Description
The contents of the specified data memory are incremented by 1. If the result is 0, the next
instruction is skipped and the result is stored in the accumulator. The data memory remains unchanged. If the result is 0, the following instruction, fetched during the current instruction execution, is discarded and a dummy cycle is replaced to get the proper
instruction (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Operation
Skip if ([m]+1)=0, ACC ¬ ([m]+1)
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SNZ [m].i
Skip if bit i of the data memory is not 0
Description
If bit i of the specified data memory is not 0, the next instruction is skipped. If bit i of the data
memory is not 0, the following instruction, fetched during the current instruction execution,
is discarded and a dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Operation
Skip if [m].i¹0
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
34
January 9, 2007
HT48F70E
SUB A,[m]
Subtract data memory from the accumulator
Description
The specified data memory is subtracted from the contents of the accumulator, leaving the
result in the accumulator.
Operation
ACC ¬ ACC+[m]+1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
SUBM A,[m]
Subtract data memory from the accumulator
Description
The specified data memory is subtracted from the contents of the accumulator, leaving the
result in the data memory.
Operation
[m] ¬ ACC+[m]+1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
SUB A,x
Subtract immediate data from the accumulator
Description
The immediate data specified by the code is subtracted from the contents of the accumulator, leaving the result in the accumulator.
Operation
ACC ¬ ACC+x+1
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
Ö
Ö
Ö
Ö
SWAP [m]
Swap nibbles within the data memory
Description
The low-order and high-order nibbles of the specified data memory (1 of the data memories) are interchanged.
Operation
[m].3~[m].0 « [m].7~[m].4
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SWAPA [m]
Swap data memory and place result in the accumulator
Description
The low-order and high-order nibbles of the specified data memory are interchanged, writing the result to the accumulator. The contents of the data memory remain unchanged.
Operation
ACC.3~ACC.0 ¬ [m].7~[m].4
ACC.7~ACC.4 ¬ [m].3~[m].0
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
35
January 9, 2007
HT48F70E
SZ [m]
Skip if data memory is 0
Description
If the contents of the specified data memory are 0, the following instruction, fetched during
the current instruction execution, is discarded and a dummy cycle is replaced to get the
proper instruction (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Operation
Skip if [m]=0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SZA [m]
Move data memory to ACC, skip if 0
Description
The contents of the specified data memory are copied to the accumulator. If the contents is
0, the following instruction, fetched during the current instruction execution, is discarded
and a dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed
with the next instruction (1 cycle).
Operation
Skip if [m]=0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
SZ [m].i
Skip if bit i of the data memory is 0
Description
If bit i of the specified data memory is 0, the following instruction, fetched during the current
instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (2 cycles). Otherwise proceed with the next instruction (1 cycle).
Operation
Skip if [m].i=0
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
TABRDC [m]
Move the ROM code (current page) to TBLH and data memory
Description
The low byte of ROM code (current page) addressed by the table pointer (TBLP) is moved
to the specified data memory and the high byte transferred to TBLH directly.
Operation
[m] ¬ ROM code (low byte)
TBLH ¬ ROM code (high byte)
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
TABRDL [m]
Move the ROM code (last page) to TBLH and data memory
Description
The low byte of ROM code (last page) addressed by the table pointer (TBLP) is moved to
the data memory and the high byte transferred to TBLH directly.
Operation
[m] ¬ ROM code (low byte)
TBLH ¬ ROM code (high byte)
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
¾
¾
¾
¾
36
January 9, 2007
HT48F70E
XOR A,[m]
Logical XOR accumulator with data memory
Description
Data in the accumulator and the indicated data memory perform a bitwise logical Exclusive_OR operation and the result is stored in the accumulator.
Operation
ACC ¬ ACC ²XOR² [m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
XORM A,[m]
Logical XOR data memory with the accumulator
Description
Data in the indicated data memory and the accumulator perform a bitwise logical Exclusive_OR operation. The result is stored in the data memory. The 0 flag is affected.
Operation
[m] ¬ ACC ²XOR² [m]
Affected flag(s)
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
XOR A,x
Logical XOR immediate data to the accumulator
Description
Data in the accumulator and the specified data perform a bitwise logical Exclusive_OR operation. The result is stored in the accumulator. The 0 flag is affected.
Operation
ACC ¬ ACC ²XOR² x
Affected flag(s)
Rev. 1.00
TO
PDF
OV
Z
AC
C
¾
¾
¾
Ö
¾
¾
37
January 9, 2007
HT48F70E
Package Information
48-pin SSOP (300mil) Outline Dimensions
4 8
2 5
A
B
2 4
1
C
C '
G
H
D
Symbol
Rev. 1.00
a
F
E
Dimensions in mil
Min.
Nom.
Max.
A
395
¾
420
B
291
¾
299
C
8
¾
12
C¢
613
¾
637
D
85
¾
99
E
¾
25
¾
F
4
¾
10
G
25
¾
35
H
4
¾
12
a
0°
¾
8°
38
January 9, 2007
HT48F70E
64-pin QFP (14´20) Outline Dimensions
C
H
D
5 1
G
3 3
I
5 2
3 2
F
A
B
E
2 0
6 4
K
a
J
1
Symbol
A
Rev. 1.00
1 9
Dimensions in mm
Min.
Nom.
Max.
18.80
¾
19.20
B
13.90
¾
14.10
C
24.80
¾
25.20
D
19.90
¾
20.10
E
¾
1
¾
F
¾
0.40
¾
G
2.50
¾
3.10
H
¾
¾
3.40
I
¾
0.10
¾
J
1.15
¾
1.45
K
0.10
¾
0.20
a
0°
¾
7°
39
January 9, 2007
HT48F70E
Product Tape and Reel Specifications
Reel Dimensions
D
T 2
A
C
B
T 1
SSOP 48W
Symbol
Description
Dimensions in mm
A
Reel Outer Diameter
B
Reel Inner Diameter
100±0.1
C
Spindle Hole Diameter
13.0+0.5
-0.2
D
Key Slit Width
2.0±0.5
T1
Space Between Flange
32.2+0.3
-0.2
T2
Reel Thickness
38.2±0.2
Rev. 1.00
330±1.0
40
January 9, 2007
HT48F70E
Carrier Tape Dimensions
P 0
D
P 1
t
E
F
W
D 1
C
B 0
K 1
P
K 2
A 0
SSOP 48W
Symbol
Description
Dimensions in mm
W
Carrier Tape Width
32.0±0.3
P
Cavity Pitch
16.0±0.1
E
Perforation Position
1.75±0.1
F
Cavity to Perforation (Width Direction)
14.2±0.1
D
Perforation Diameter
2.0 Min.
D1
Cavity Hole Diameter
1.5+0.25
P0
Perforation Pitch
4.0±0.1
P1
Cavity to Perforation (Length Direction)
2.0±0.1
A0
Cavity Length
12.0±0.1
B0
Cavity Width
16.20±0.1
K1
Cavity Depth
2.4±0.1
K2
Cavity Depth
3.2±0.1
t
Carrier Tape Thickness
C
Cover Tape Width
Rev. 1.00
0.35±0.05
25.5
41
January 9, 2007
HT48F70E
Holtek Semiconductor Inc. (Headquarters)
No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan
Tel: 886-3-563-1999
Fax: 886-3-563-1189
http://www.holtek.com.tw
Holtek Semiconductor Inc. (Taipei Sales Office)
4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan
Tel: 886-2-2655-7070
Fax: 886-2-2655-7373
Fax: 886-2-2655-7383 (International sales hotline)
Holtek Semiconductor Inc. (Shanghai Sales Office)
7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233
Tel: 86-21-6485-5560
Fax: 86-21-6485-0313
http://www.holtek.com.cn
Holtek Semiconductor Inc. (Shenzhen Sales Office)
5/F, Unit A, Productivity Building, Cross of Science M 3rd Road and Gaoxin M 2nd Road, Science Park, Nanshan District,
Shenzhen, China 518057
Tel: 86-755-8616-9908, 86-755-8616-9308
Fax: 86-755-8616-9533
Holtek Semiconductor Inc. (Beijing Sales Office)
Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031
Tel: 86-10-6641-0030, 86-10-6641-7751, 86-10-6641-7752
Fax: 86-10-6641-0125
Holtek Semiconductor Inc. (Chengdu Sales Office)
709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016
Tel: 86-28-6653-6590
Fax: 86-28-6653-6591
Holmate Semiconductor, Inc. (North America Sales Office)
46729 Fremont Blvd., Fremont, CA 94538
Tel: 1-510-252-9880
Fax: 1-510-252-9885
http://www.holmate.com
Copyright Ó 2007 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used
solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable
without further modification, nor recommends the use of its products for application that may present a risk to human life
due to malfunction or otherwise. Holtek¢s products are not authorized for use as critical components in life support devices
or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information,
please visit our web site at http://www.holtek.com.tw.
Rev. 1.00
42
January 9, 2007