Fujitsu F2MC-16LX Hardware Manual page 59

■ Register Banks
A register bank consists of eight words. As with ordinary RAM, the contents of the register bank
are not initialized by a reset and the status before the reset is retained. However, the values
contained in the register bank are undefined at power-on.
As shown in Table 2.5-1, register banks can be used as general-purpose registers in the type of
byte registers R0 to R7, word registers RW0 to RW7, and long word registers RL0 to RL3. They
can also be used for arithmetic operations to store an instruction or a pointer. RL0 to RL3 can
also be used as linear pointers for directly accessing all regions of the memory space.
Table 2.5-1 Functions of Register Banks
Register
R0 to R7
RW0 to RW7
RL0 to RL3
Notes:
• R0 is also used as a barrel shift counter and normalize instruction counter.
• RW0 is also used as a string instruction counter.
Used as operands of instructions.
Used as pointers and operands of instructions.
Used as long pointers and operands of instructions.
2.5 General-purpose Registers
Function
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