HT45FM03B(2009) 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT45FM03B
(Rev.:2009)

Brushless DC Motor Flash Type 8-Bit MCU

Holtek Semiconductor 

HT45FM03B

tempreg1

tempreg2

mov

mov

tabrdl

dec

tabrdl

org

dc

db

?

db

?

:

:

a,06h

tblp,a

:

:

tempreg1

tblp

; temporary register #1

; temporary register #2

; initialise table pointer - note that this address

; is referenced

; to the last page or present page

; transfers value in table referenced by table pointer

; to tempregl

; data at prog. memory address ²F06H² transferred to

; tempreg1 and TBLH

; reduce value of table pointer by one

tempreg2

:

:

0F00h

; transfers value in table referenced by table pointer

; to tempreg2

; data at prog.memory address ²F05H² transferred to

; tempreg2 and TBLH

; in this example the data ²1AH² is transferred to

; tempreg1 and data ²0FH² to register tempreg2

; the value ²0FH² will be transferred to the high byte

; register TBLH

; sets initial address of last page

00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh

:

:

In Circuit Programming

The provision of Flash type Program Memory provides

the user with a means of convenient and easy upgrades

and modifications to their programs on the same device.

As an additional convenience, Holtek has provided a

means of programming the microcontroller in-circuit us-

ing a 5-pin interface. This provides manufacturers with

the possibility of manufacturing their circuit boards com-

plete with a programmed or un-programmed

microcontroller, and then programming or upgrading the

program at a later stage. This enables product manufac-

turers to easily keep their manufactured products sup-

plied with the latest program releases without removal

and re-insertion of the device.

The Program Memory can be programmed serially

in-circuit using this 5-wire interface. Data is downloaded

and uploaded serially on a single pin with an additional

line for the clock. Two additional lines are required for

the power supply and one line for the reset. The techni-

cal details regarding the in-circuit programming of the

devices are beyond the scope of this document and will

be supplied in supplementary literature.

During the programming process the RES pin will be

held low by the programmer disabling the normal opera-

tion of the microcontroller and taking control of the PA0

and PA2 I/O pins for data and clock programming pur-

poses. The user must there take care to ensure that no

other outputs are connected to these two pins.

W r ite r C o n n e c to r

S ig n a ls

W r ite r _ V D D

M C U P r o g r a m m in g

P in s

VDD

RES

PD1

D ATA

PA0

C LK

PA2

W r ite r _ V S S

VSS

***

Note:

T o o th e r C ir c u it

* may be resistor or capacitor. The resistance

of * must be greater than 1kW or the capacitance

of * must be less than 1nF.

Rev. 1.00

14

December 16, 2009

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