HT46F46E datasheet(13/88 Pages) HOLTEK

13 / 88 page

HT46F46E/HT46F47E/HT46F48E/HT46F49E

Rev. 1.40

July 28, 2009

tempreg1 db

; temporary register #1

tempreg2 db

; temporary register #2

mov

a,06h

; initialise table pointer - note that this address

; is referenced

mov

tblp,a

; to the last page or present page

tabrdl

tempreg1

; transfers value in table referenced by table pointer

; to tempregl

; data at prog. memory address

²706H² transferred to

; tempreg1 and TBLH

dec

tblp

; reduce value of table pointer by one

tabrdl

tempreg2

; transfers value in table referenced by table pointer

; to tempreg2

; data at prog.memory address

²705H² transferred to

; tempreg2 and TBLH

; in this example the data

²1AH² is transferred to

; tempreg1 and data

²0FH² to register tempreg2

; the value

²00H² will be transferred to the high byte

; register TBLH

org

700h

; sets initial address of last page (for HT46F47E)

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

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.

In Circuit Programming

The provision of Flash Program Memory gives the user

and designer the convenience of easy upgrades and mod-

ifications to their programs on the same device. As an ad-

ditional convenience, Holtek has provided a means of

programming the microcontroller in-circuit. This provides

manufacturers with the possibility of manufacturing their

circuit boards complete with a programmed or un-pro-

grammed Flash Type microcontroller, and then program-

ming or upgrading the program at a later stage. This

enables product manufacturers to easily keep their manu-

factured products supplied with the latest program re-

leases without removal and re-insertion of the device.

Pin Name

Function

PA0

Serial data input/output

PA4

Serial clock

RES

Device reset

VDD

Power supply

VSS

Ground

Instruction

Table Location Bits

b11

b10

TABRDC [m] PC11

PC10

PC9

PC8

TABRDL [m]

1111

Table Location

Note:

PC11~PC8: Current Program Counter bits

@7~@0: Table Pointer TBLP bits

For the HT46F49E the Table address location is 12 bits, i.e. from b11~b0.

For the HT46F47E and HT46F48E, the Table address location is 11 bits, i.e. from b10~b0.

For the HT46F46E, the Table address location is 10 bits, i.e. from b9~b0.

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