Bank Pointer Register -- BS83B08-3, BS83B12-3, BS83B16-3 and BS83B16G-3
Bit
7
6
5
4
3
2
1
0
Name
¾
¾
¾
¾
¾
¾
¾
DMBP0
R/W
¾
¾
¾
¾
¾
¾
¾
R/W
POR
¾
¾
¾
¾
¾
¾
¾
0
Bit 7 ~ 1
unimplemented, read as
²
0
²
Bit 0
DMBP0
: select data memory banks
0: bank 0
1: bank 1
Bank Pointer Register -- BS83C24-3
Bit
7
6
5
4
3
2
1
0
Name
¾
¾
¾
¾
¾
¾
DMBP1
DMBP0
R/W
¾
¾
¾
¾
¾
¾
R/W
R/W
POR
¾
¾
¾
¾
¾
¾
0
0
Bit 7 ~ 1
unimplemented, read as
²
0
²
Bit 0
DMBP1~DMBP0
: select data memory banks
0: bank 0
1: bank 1
2: bank 2
3: bank 3
Accumulator
-
ACC
The Accumulator is central to the operation of any microcontroller and is closely related with
operations carried out by the ALU. The Accumulator is the place where all intermediate results from
the ALU are stored. Without the Accumulator it would be necessary to write the result of each
calculation or logical operation such as addition, subtraction, shift, etc., to the Data Memory resulting
in higher programming and timing overheads. Data transfer operations usually involve the temporary
storage function of the Accumulator; for example, when transferring data between one user defined
register and another, it is necessary to do this by passing the data through the Accumulator as no direct
transfer between two registers is permitted.
Program Counter Low Register
-
PCL
To provide additional program control functions, the low byte of the Program Counter is made
accessible to programmers by locating it within the Special Purpose area of the Data Memory. By
manipulating this register, direct jumps to other program locations are easily implemented. Loading a
value directly into this PCL register will cause a jump to the specified Program Memory location,
however, as the register is only 8-bit wide, only jumps within the current Program Memory page are
permitted. When such operations are used, note that a dummy cycle will be inserted.
Look-up Table Registers
-
TBLP, TBHP, TBLH
These three special function registers are used to control operation of the look-up table which is stored
in the Program Memory. TBLP and TBHP are the table pointer and indicates the location where the
table data is located. Their value must be setup before any table read commands are executed. Their
value can be changed, for example using the
²
INC
²
or
²
DEC
²
instructions, allowing for easy table data
pointing and reading. TBLH is the location where the high order byte of the table data is stored after a
table read data instruction has been executed. Note that the lower order table data byte is transferred to
a user defined location.
BS83B08-3/B12-3/B16-3/B16G-3/C24-3
8-Bit Touch Key Flash MCU
Rev. 1.50
29
April 28, 2020
