HT83F02 datasheet(14/64 Pages) HOLTEK

14 / 64 page

HT83F02

Rev. 1.20

November 19, 2010

Because the TBLH register is a read-only register and

cannot be restored, care should be taken to ensure its

protection if both the main routine and Interrupt Service

Routine use table read instructions. If using the table

read instructions, the Interrupt Service Routines may

change the value of the TBLH and subsequently cause

errors if used again by the main routine. As a rule it is

recommended that simultaneous use of the table read

instructions should be avoided. However, in situations

where simultaneous use cannot be avoided, the inter-

rupts should be disabled prior to the execution of any

main routine table-read instructions. Note that all table

related instructions require two instruction cycles to

complete their operation.

Instruction

Table Location

*10

TABRDC [m]

P10

TABRDL [m]

Table Location

Note:

*10~*0: Current Program ROM table

P10~P8: Write P12~P8 to TBHP pointer register

@7~@0: Write @7~@0 to TBLP pointer register

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.

MCU Programming

Pins

Function

PA0

Serial Data Input/Output

PA2

Serial Clock

RES

Device Reset

VDD

Power Supply

VSS

Ground

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.

Programmer Pin

MCU Pins

RES

PC0

DATA

PA0

CLK

PA2

Programmer and MCU Pins

W r i t e r _ V D D

R E S

D A T A

C L K

W r i t e r _ V S S

T o o t h e r C i r c u i t

D A T A

C L K

V S S

R E S

V D D

W r i t e r C o n n e c t o r

S i g n a l s

M C U P r o g r a m m i n g

P i n s

Note: * may be resistor or capacitor. The resistance

of * must be greater than 1k

W or the capacitance

of * must be less than 1nF.

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