Allocation Of Multi-Byte Data In Memory - Fujitsu MB90895 Series Hardware Manual

3.1.6

Allocation of Multi-byte Data in Memory

Multi-byte data is written to memory in sequence starting from the low addresses. For
32- bit length data, the lower 16 bits are written first, and then the higher 16 bits are
written.
If a reset signal is output immediately after the lower 16 bits is written, the higher data
may not be written.
I Store of Multi-byte Data in RAM
Figure 3.1-8 "Store of Multi-byte Data in RAM" shows the order in which multi-byte data is stored. Lower
8 bits are allocated to n address, and in order of n+1, n+2 n+3 and.
Lower address
n address
n+1
n+2
n+3
Upper address
MSB Most significant bit
LSB Least significant bit
I Storage of Multi-byte Length Operand
Figure 3.1-9 "Storage of Multi-byte Operand" shows the configuration of a multi-byte length operand in
memory.
JMPP 123456
Lower address
n address
n+1
n+2
n+3
Upper address
Figure 3.1-8 Store of Multi-byte Data in RAM
00010100
B
11111111
B
11001100
B
01010101
B
Figure 3.1-9 Storage of Multi-byte Operand
H
63
H
56
H
34
H
12
H
MSB
01010101 11001100
B B
JMPP 1 2 3 4 5 6
CHAPTER 3 CPU
LSB
11111111 00010100
B
B
H
29