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HT56R22 датащи(PDF) 20 Page - Holtek Semiconductor Inc

номер детали HT56R22
подробное описание детали  TinyPowerTM A/D Type 8-Bit OTP MCU with DAC
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
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HT56R22 датащи(HTML) 20 Page - Holtek Semiconductor Inc

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HT56R22/HT56R23/HT56R24/HT56R25/HT56R26
Rev. 1.30
20
December 26, 2014
· Multifunction Interrupt vector
The Multi-function Interrupt vector is shared by sev-
eral internal functions such as a Time Base overflow, a
Real Time Clock overflow, an A/D converter conver-
sion completion, a falling edge appearing on the Ex-
ternal Peripheral interrupt pin, a Timer/Event Counter
2 or a Timer/Event Counter 3 overflow, a SPI data
transfer completion. The program will jump to this lo-
cation and begin execution if the relevant interrupt is
enabled and the stack is not full.
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. This register defines the lower 8-bit address of
the look-up table.
After setting up the table pointer, the table data can be
retrieved from the current Program Memory page or last
Program Memory page using the
²TABRDC[m]² or
²TABRDL [m]² instructions, respectively. When these in-
structions are executed, the lower order table byte from
the Program Memory will be transferred to the user de-
fined Data Memory register [m] as specified in the in-
struction. 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 accompanying example shows how the table
pointer and table data is defined and retrieved from the
device. This example uses raw table data located in the
last page which is stored there using the ORG state-
ment. The value at this ORG statement is
²700H² which
refers to the start address of the last page within the 2K
Program Memory of the HT56R22 microcontrollers. 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
²706H² or 6 locations after the start of the last page.
Note that the value for the table pointer is referenced to
the first address of the present page 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 trans-
ferred 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 the table read instructions. If using the table
read instructions, the Interrupt Service Routines may
change the value of TBLH and subsequently cause er-
rors if used again by the main routine. As a rule it is rec-
ommended 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 Bits
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
TABRDC [m] PC14 PC13 PC12 PC11 PC10 PC9 PC8
@7
@6
@5
@4
@3
@2
@1
@0
Table Location
Note:
PC14~PC8: Current Program Counter bits
@7~@0: Table Pointer TBLP bits
For the HT56R22, the Table address location is 11 bits, i.e. from b10~b0.
For the HT56R23, the Table address location is 12 bits, i.e. from b11~b0.
For the HT56R24, the Table address location is 13 bits, i.e. from b12~b0.
For the HT56R25, the Table address location is 14 bits, i.e. from b13~b0.
For the HT56R26, the Table address location is 15 bits, i.e. from b14~b0.
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
p r e s e n t p a g e
P C x ~ P C 8
P C H i g h B y t e
T B L P R e g i s t e r
D a t a
1 4 ~ 1 6 b i t s
P r o g r a m M e m o r y


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