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HT46R01 参数 Datasheet PDF下载

HT46R01图片预览
型号: HT46R01
PDF下载: 下载PDF文件 查看货源
内容描述: 10引脚MSOP A / D型8位OTP MCU [10-Pin MSOP A/D Type 8-Bit OTP MCU]
分类和应用:
文件页数/大小: 60 页 / 482 K
品牌: HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
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HT46R01/HT46R02/HT46R03  
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Stack  
Arithmetic operations: ADD, ADDM, ADC, ADCM,  
SUB, SUBM, SBC, SBCM, DAA  
This is a special part of the memory which is used to  
save the contents of the Program Counter only. The  
stack can have either 4, 6 or 8 levels depending upon  
which device is selected 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 con-  
tents of the Program Counter are pushed onto the stack.  
At the end of a subroutine or an interrupt routine, sig-  
naled by a return instruction, RET or RETI, the Program  
Counter is restored to its previous value from the stack.  
After a device reset, the Stack Pointer will point to the  
top of the stack.  
Logic operations: AND, OR, XOR, ANDM, ORM,  
XORM, CPL, CPLA  
Rotation RRA, RR, RRCA, RRC, RLA, RL, RLCA,  
RLC  
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·
Increment and Decrement INCA, INC, DECA, DEC  
Branch decision, JMP, SZ, SZA, SNZ, SIZ, SDZ,  
SIZA, SDZA, CALL, RET, RETI  
Program Memory  
The Program Memory is the location where the user  
code or program is stored. These devices are supplied  
with One-Time Programmable, OTP, memory where us-  
ers can program their application code into the device.  
By using the appropriate programming tools, OTP de-  
vices offer users the flexibility to freely develop their ap-  
plications which may be useful during debug or for  
products requiring frequent upgrades or program  
changes. OTP devices are also applicable for use in ap-  
plications that require low or medium volume production  
runs.  
If the stack is full and an enabled interrupt takes place,  
the interrupt request flag will be recorded but the ac-  
knowledge signal will be inhibited. When the Stack  
Pointer is decremented, by RET or RETI, the interrupt  
will be serviced. This feature prevents stack overflow al-  
lowing the programmer to use the structure more easily.  
However, when the stack is full, a CALL subroutine in-  
struction can still be executed which will result in a stack  
overflow. Precautions should be taken to avoid such  
cases which might cause unpredictable program  
branching.  
Structure  
The Program Memory has a capacity of 1K by 14, 2K by  
14 or 4K by 15 bits depending upon which device is se-  
lected. The Program Memory is addressed by the Pro-  
gram Counter and also contains data, table information  
and interrupt entries. Table data, which can be setup in  
any location within the Program Memory, is addressed  
by separate table pointer registers.  
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Special Vectors  
Within the Program Memory, certain locations are re-  
served for special usage such as reset and interrupts.  
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N
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Location 000H  
Note: For the HT46R01, N=4, i.e. 4 levels of stack  
This vector is reserved for use by the device reset for  
program initialisation. After a device reset is initiated,  
the program will jump to this location and begin execu-  
tion.  
available.  
For the HT46R02, N=6, i.e. 6 levels of stack  
available.  
For the HT46R03, N=8, i.e. 8 levels of stack  
available.  
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Location 004H  
This vector is used by the external interrupt. If the ex-  
ternal interrupt pin on the device receives an edge  
transition, the program will jump to this location and  
begin execution if the external interrupt is enabled and  
the stack is not full. The external interrupt active edge  
transition type, whether high to low, low to high or both  
is specified in the CTRL1 register.  
Arithmetic and Logic Unit - ALU  
The arithmetic-logic unit or ALU is a critical area of the  
microcontroller that carries out arithmetic and logic op-  
erations of the instruction set. Connected to the main  
microcontroller data bus, the ALU receives related in-  
struction codes and performs the required arithmetic or  
logical operations after which the result will be placed in  
the specified register. As these ALU calculation or oper-  
ations may result in carry, borrow or other status  
changes, the status register will be correspondingly up-  
dated to reflect these changes. The ALU supports the  
following functions:  
·
Location 008H  
This internal vector is used by the Timer/Event Coun-  
ter 0. If a counter overflow occurs, the program will  
jump to this location and begin execution if the  
timer/event counter interrupt is enabled and the stack  
is not full.  
Rev. 1.00  
8
September 21, 2007  
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