HT46R016 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT46R016

Enhanced A/D Type 8-Bit OTP MCU

Holtek Semiconductor 

HT46R016/HT46R017

Enhanced A/D Type 8-Bit OTP MCU

Special Vectors

Within the Program Memory, certain locations are reserved for special usage such as reset and

interrupts.

●● Reset Vector

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 execution.

●● External interrupt vector

This vector is used by the external interrupt. If the external 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 anthe stack is not full. The external interrupt active edg transition type, whether high to

low, low to high or both is specified in the CTRL0 register.

●● Timer/Event 0/1 counter interrupt vector

This internal vector is used by the Timer/Event Counters. If a Timer/Event Counter overflow

occurs, the program will jump to its respective location and begin execution if the associated

Timer/Event Counter interrupt is enabled and the stack is not full.

●● Time base interrupt vector

This internal vector is used by the internal Time Base. If a Time Base overflow occurs, the

program will jump to this location and begin execution if the Time Base counter interrupt is

enabled and the stack is not full.

Look-up Table

Any location within the Program Memory can be defined as a look-up table where programmers can

store fixed data. To use the look-up table, the table pointer must first be setup by placing the address

of the look up data to be retrieved in the table pointer register, TBLP. These registers define the total

address of the look-up table.

After setting up the table pointer, the table data can be retrieved from the current Program Memory

page or last Program Memory page using the “TABRDC [m]” or “TABRDL [m]” instructions,

respectively. When these instructions are executed, the lower order table byte from the Program

Memory will be transferred to the user defined Data Memory register [m] as specified in the

instruction. The higher order table data byte from the Program Memory will be transferred to the

TBLH special register. Any unused bits in this transferred higher order byte will be read as “0”.

The following diagram illustrates the addressing data flow of the look-up table:

Last page or

present page

PCx~PC8

PC High Byte

TBLP Register

Program Memory

Data

16 bits

Register TBLH

High Byte

User Selected

Register

Low Byte

Rev. 1.00

16

July 16, 2012

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