HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 97

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

3.9 Programming Notes
3.9.1 Restriction on Address Location
The following restriction applies when instructions are located in on-chip RAM.
• Restriction
• Solution
Instruction execution cannot proceed continuously from an external address to on-chip RAM in
the ZTAT versions. This restriction does not apply to versions with masked ROM.
To execute instructions located in on-chip RAM, use a branch instruction (examples: Bcc, JMP,
etc.) to branch to the first instruction located in on-chip RAM. Do not place instruction code in
the last three bytes of external memory (H'FB7D to H'FB7F).
H'FB7A
H'FB7B
H'FB7C
H'FB7D
H'FB7E
H'FB7F
H'FB80
H'FB81
Execution Disabled
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
Not
executable
78
H'FB7A
H'FB7B
H'FB7C
H'FB7D
H'FB7E
H'FB7F
H'FB80
H'FB81
Execution Enabled
NOP
NOP
NOP
BRA
disp
Do not
place
instruction
code here
Branch