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HT82A525R Arkusz danych(PDF) 15 Page - Holtek Semiconductor Inc

Numer części HT82A525R
Szczegółowy opis  I/O Type USB 8-Bit OTP MCU with SPI
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Producent  HOLTEK [Holtek Semiconductor Inc]
Strona internetowa  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

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· Location 018H
Location 018H is reserved for the Serial Interface 2. When 8 bits data have been received or
transmitted successfully from Serial Interface 2, the related interrupts are enabled, and the stack is
not full, the program begins execution at location 018H.
· Table location
Any location in the program memory can be used as a look-up tables. There are three methods to
read the ROM data using two table read instructions
²TABRDC² and ²TABRDL², transfer the
contents of the lower-order byte to the specified data memory, and the higher-order byte to TBLH
(08H).
The three methods are shown as follows:
¨ The instruction
²TABRDC [m]² (the current page, one page=256 words), where the table location
is defined by TBLP (07H) in the current page. The configuration option, TBHP, is disabled (de-
fault).
¨ The instructions
²TABRDC [m]², where the table location is defined by registers TBLP (07H) and
TBHP (01FH). The configuration option, TBHP, is enabled.
¨ The instruction
²TABRDL [m]², where the table locations is defined by registers TBLP (07H) in
the last page (0F00H~0FFFH).
Instruction
Table Location
*11
*10
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
TABRDC [m]
P11
P10
P9
P8
@7
@6
@5
@4
@3
@2
@1
@0
TABRDL [m]
1111
@7
@6
@5
@4
@3
@2
@1
@0
Table Location
Note:
*11~*0: Table location bits
P11~P8: Current program counter bits
@7~@0: Table pointer bits
Only the destination of the lower-order byte in the table is well-defined, the other bits of the table
word are transferred to the lower portion of TBLH. The Table Higher-order byte register (TBLH) is
read only and cannot be restored. The table pointer (TBLP, TBHP) is a read/write register (07H,
1FH), which indicates the table location. Before accessing the table, the location must be placed in
the TBLP and TBHP registers(If the configuration option TBHP is disabled, the value in TBHP has
no effect).
If the main routine and the ISR (Interrupt Service Routine) both employ the table read instruction, the
contents of the TBLH in the main routine is likely to be changed by the table read instruction used in
the ISR. As a result errors may occur. In other words, using the table read instruction in the main
routine and in the ISR simultaneously should be avoided. However, if the table read instruction has to
be applied in both the main routine and the ISR, the interrupt should be disabled prior to the table read
instruction.
It will not be enabled until the TBLH has been backed up. All table related instructions require two
cycles to complete the operation. These areas may function as normal program memory depending on
the requirements.
Once TBHP is enabled, the instruction
²TABRDC [m]² reads the ROM data as defined by TBLP and
TBHP register value. Otherwise, if the configuration option TBHP is disabled, the instruction
²TABRDC [m]² reads the ROM data as defined by TBLP and the current program counter bits.
Rev. 1.80
15
March 11, 2016
HT82A525R
I/O Type USB 8-Bit OTP MCU with SPI


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