HD6433682 ETC, HD6433682 Datasheet - Page 71

• Manufacturer Part Number: HD6433682
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
• Manufacturer: ETC

2.8
2.8.1
The address space of this LSI includes empty areas in addition to the ROM, RAM, and on-chip
I/O registers areas available to the user. When data is transferred from CPU to empty areas, the
transferred data will be lost. This action may also cause the CPU to malfunction. When data is
transferred from an empty area to CPU, the contents of the data cannot be guaranteed.
2.8.2
EEPMOV is a block-transfer instruction and transfers the byte size of data indicated by R4L,
which starts from the address indicated by R5, to the address indicated by R6. Set R4L and R6 so
that the end address of the destination address (value of R6
value of R6 must not change from H'FFFF to H'0000 during execution).
2.8.3
The BSET, BCLR, BNOT, BST, and BIST instructions read data from the specified address in
byte units, manipulate the data of the target bit, and write data to the same address again in byte
units. Special care is required when using these instructions in cases where two registers are
assigned to the same address, or when a bit is directly manipulated for a port or a register
containing a write-only bit, because this may rewrite data of a bit other than the bit to be
manipulated.
Usage Notes
Notes on Data Access to Empty Areas
EEPMOV Instruction
Bit-Manipulation Instruction
Program halt state
Reset
occurs
Reset state
Figure 2.12 State Transitions
Reset
occurs
SLEEP instruction executed
Reset cleared
Reset occurs
Interrupt
source
Exception-handling state
Program execution state
R4L) does not exceed H'FFFF (the
Interrupt
source
Rev. 3.00, 05/03, page 41 of 472
Exception-
handling
complete