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µPD750008 USER'S MANUAL
Remark "Function" in this section is applicable to the µPD750008 whose program counter consists of
13 bits (addr = 0000H to 1FFFH).
However, this is also applicable to the µPD750004 whose program counter consists of 12 bits
(addr = 0000H to 0FFFH), the µPD750006 whose program counter consists of 13 bits (addr =
0000H to 17FFH), and the µPD75P0016 whose program counter consists of 14 bits (addr = 0000H
to 3FFFH).
BRCB !caddr
Function: For the µPD750008 PC
Branches to the address specified by the program counter whose low-order 12 bits
(PC
) have been replaced with the 12-bit immediate data caddr (A
11-0
Since the program counter of the µPD750004 consists of 11 bits, this instruction enables a branch to any
location in the program memory space.
In the µPD750006 and µPD750008, PC
Similarly, in the µPD75P0016, PC
Caution The BRCB !caddr instruction usually causes a branch within the block containing the
instruction. However, if the first byte is located at address 0FFEH or 0FFFH, a branch to
block 1 instead of block 0 occurs.
If the BRCB !caddr instruction is located at a or b in the figure above, a branch to block 1 instead of block
0 occurs.
Remark "Function" in this section is applicable to the µPD750008 whose program counter consists of
13 bits (addr = 0000H to 1FFFH).
However, this is also applicable to the µPD750004 whose program counter consists of 12
bits (addr = 0000H to 0FFFH), the µPD750006 whose program counter consists of 13 bits
(addr = 0000H to 17FFH), and the µPD75P0016 whose program counter consists of 14 bits
(addr = 0000H to 3FFFH).
286
<– PC
12-0
12
caddr = n000H-nFFFH
n = PC
= 0, 1
12
cannot be changed, so no branch occurs beyond the block.
12
and PC
cannot be changed, so no branch occurs beyond the block.
12
13
7
Block 0
0FFEH
0FFFH
1000H
Block 1
+ caddr
11-0
11-0
Program memory
0
).
a
b
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