HT45F0057 datasheet(21/88 Pages) HOLTEK

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HT45F0057

Induction Cooker Flash MCU

HT45F0057

Induction Cooker Flash MCU

Bank Pointer – BP

For this device, the Data Memory is divided into two banks, Bank0 and Bank1. Selecting the

required Data Memory area is achieved using the Bank Pointer. Bit 0 of the Bank Pointer is used to

select Data Memory Banks 0~1.

The Data Memory is initialised to Bank 0 after a reset, except for a WDT time-out reset in the Power

Down Mode, in which case, the Data Memory bank remains unaffected. It should be noted that the

Special Function Data Memory is not affected by the bank selection, which means that the Special

Function Registers can be accessed from within any bank. Directly addressing the Data Memory

will always result in Bank 0 being accessed irrespective of the value of the Bank Pointer. Accessing

data from Bank1 must be implemented using Indirect Addressing.

BP Register

Bit

Name

—

DMBP

R/W

—

R/W

P�R

—

Bit 7~1

Unimplemented, read as “0”

Bit 0

DMBP: Select Data Memory Banks

0: Bank 0

1: Bank 1

Accumulator – ACC

The Accumulator is central to the operation of any microcontroller and is closely related with

operations carried out by the ALU. The Accumulator is the place where all intermediate results

from the ALU are stored. Without the Accumulator it would be necessary to write the result of

each calculation or logical operation such as addition, subtraction, shift, etc., to the Data Memory

resulting in higher programming and timing overheads. Data transfer operations usually involve

the temporary storage function of the Accumulator; for example, when transferring data between

one user defined register and another, it is necessary to do this by passing the data through the

Accumulator as no direct transfer between two registers is permitted.

Program Counter Low Register – PCL

To provide additional program control functions, the low byte of the Program Counter is made

accessible to programmers by locating it within the Special Purpose area of the Data Memory. By

manipulating this register, direct jumps to other program locations are easily implemented. Loading

a value directly into this PCL register will cause a jump to the specified Program Memory location,

however, as the register is only 8-bit wide, only jumps within the current Program Memory page are

permitted. When such operations are used, note that a dummy cycle will be inserted.

Look-up Table Registers – TBLP, TBLH

These two special function registers are used to control operation of the look-up table which is

stored in the Program Memory. TBLP is the table pointer and indicates the location where the table

data is located. Its value must be setup before any table read commands are executed. Its value

can be changed, for example using the “INC” or “DEC” instructions, allowing for easy table data

pointing and reading. TBLH is the location where the high order byte of the table data is stored

after a table read data instruction has been executed. Note that the lower order table data byte is

transferred to a user defined location.

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