Memory Location Of Multi-Byte Data - Fujitsu MB90460 Series Hardware Manual

3.5

Memory Location of Multi-byte Data

Multi-byte data is written to memory sequentially from the lower address. If multi-byte
data is 32-bit data, the lower 16 bits are transferred followed by the upper 16 bits.
If a reset signal is input immediately after the low-order data is written, the high-order
data may not be written.
■ Storage of Multi-byte Data in RAM
Figure 3.5-1 shows the data configuration of multi-byte data in memory. The lower 8 bits of the data is
located at address n, and subsequent data is located at address n + 1, address n + 2, address n + 3 and so on,
in this sequence.
H
Address 'n'
L
■ Storage of Multi-byte Operand
Figure 3.5-2 shows the configuration of a multi-byte operand in memory.
Address 'n'
Figure 3.5-1 Storage of Multi-byte Data in RAM
01010101
B
11001100
B
11111111
B
00010100
B
Figure 3.5-2 Storage of a Multi-byte Operand
JMPP 123456H
H
12
H
34
H
56
H
63
H
L
MSB
01010101 11001100
B
CHAPTER 3 CPU
11111111 00010100
B B
JMPP 12 34 56H
LSB
B
37