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HT56RB688 Datasheet(PDF) 26 Page - Holtek Semiconductor Inc

No. de pieza HT56RB688
Descripción Electrónicos  TinyPowerTM A/D Type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces
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Fabricante Electrónico  HOLTEK [Holtek Semiconductor Inc]
Página de inicio  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56RB688 Datasheet(HTML) 26 Page - Holtek Semiconductor Inc

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Look-up Table
Any location within the Program Memory can be defined as a look-up table where programmers can
store fixed data. To use the look-up table, the table pointer must first be setup by placing the lower
order address of the look up data to be retrieved in the table pointer register, TBLP and TBHP. These
registers define the total address of the look-up table.
After setting up the table pointer, the table data can be retrieved from the specific Program Memory
page or last Program Memory page using the ²TABRDC[m]² or ²TABRDL [m]² instructions,
respectively. When these instructions are executed, the lower order table byte from the Program
Memory will be transferred to the user defined Data Memory register [m] as specified in the
instruction. The higher order table data byte from the Program Memory will be transferred to the
TBLH special register. Any unused bits in this transferred higher order byte will be read as ²0².
The following diagram illustrates the addressing/data flow of the look-up table:
Table Program Example
The following example shows how the table pointer and table data is defined and retrieved from the
HT56RB688. This example uses raw table data located in the last page. The value at ²BF00H² which
refers to the start address of the last page within the 48K Program Memory of the HT56RB688
microcontroller. The table pointer is setup here to have an initial value of ²06H². This will ensure that
the first data read from the data table will be at the Program Memory address ²BF06H² or 6 locations
after the start of the last page. Note that the value for the table pointer is referenced to TBLP and TBHP
registers if the ²TABRDC [m]² instruction 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
instruction is executed.
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 interrupts 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.
rombank 5 code5
ds .section
¢data¢
Tempreg1 db
?
; temporary register #1
tempreg2 db
?
; temporary register #2
:
:
code0 .section
¢code¢
mov a,06h
; initialise table pointer - note that this address
; is referenced
mov tblp,a
; to the last page or the page that tbhp pointed
Rev. 1.10
26
April 15, 2013
HT56RB688
TinyPowerTM A/D type Smart Card OTP MCU
with LCD, DAC, ISO 7816 and USB Interfaces
R e g i s t e r T B L H
U s e r S e l e c t e d
R e g i s t e r
H i g h B y t e
L o w B y t e
L a s t p a g e o r
T B H P R e g i s t e r
T B L P R e g i s t e r
D a t a
1 6 b i t s
P r o g r a m M e m o r y


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