HT82K74EE datasheet(10/56 Pages) HOLTEK

10 / 56 page

HT82K74E/HT82K74EE

Rev. 1.00

December 15, 2009

Instruction

Table Location Bits

b10

TABRDC[m]

PC10

PC9

PC8

TABRDL[m]

Table Location

Note:

PC10~PC8: Current program counter bits when TBHP is disabled

TBHP register bit2~bit0 when TBHP is enabled

@7~@0: Table Pointer TBLP bits

Table Program Example

The following example shows how the table pointer and

table data is defined and retrieved from the

microcontroller. This example uses raw table data lo-

cated in the last page which is stored there using the

ORG statement. The value at this ORG statement is

²700H² which refers to the start address of the last page

within the 2K Program Memory of device. The table

pointer is setup here to have an initial value of

²06H².

This will ensure that the first data read from the data ta-

ble will be at the Program Memory address

²706H² or 6

locations after the start of the last page. Note that the

value for the table pointer is referenced to the first ad-

dress of the present page if the

²TABRDC [m]² instruc-

tion is being used. The high byte of the table data which

in this case is equal to zero will be transferred to the

TBLH register automatically when the

²TABRDL [m]² in-

struction is executed.

P r o g r a m

M e m o r y

P r o g r a m C o u n t e r

H i g h B y t e

T B L P

T B L H

S p e c i f i e d b y [ m ]

T a b l e C o n t e n t s H i g h B y t e

T a b l e C o n t e n t s L o w B y t e

Table Read

- TBLP only

P r o g r a m

M e m o r y

T B L H

S p e c i f i e d b y [ m ]

H i g h B y t e o f T a b l e C o n t e n t s

L o w B y t e o f T a b l e C o n t e n t s

T B L P

T B H P

Table Read

- TBLP/TBHP

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