Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Technical Manual page 190

II CORE BLOCK: BCU (Bus Control Unit)
For information on memory connection, see Figure 4.18.
Little-endian
Source (general-purpose register)
31
Byte 3 Byte 2
2
15
A[1:0]=10
Destination (16-bit device)
Big-endian
Source (general-purpose register)
31
Byte 3 Byte 2
1
15
A[1:0]=00
Destination (16-bit device)
Little-endian
Destination (general-purpose register)
31
Byte 3 Byte 2
2
15
A[1:0]=10
Source (16-bit device)
Big-endian
Destination (general-purpose register)
31
Byte 3 Byte 2
1
15
A[1:0]=00
Source (16-bit device)
Little-endian
Source (general-purpose register)
31
Byte 3 Byte 2
Big-endian
Source (general-purpose register)
31
Byte 3 Byte 2
Little-endian
Destination (general-purpose register)
31
Sign or Zero extension
Big-endian
Destination (general-purpose register)
31
Sign or Zero extension
B-II-4-14
Byte 1 Byte 0
1
0 15
A[1:0]=00
Byte 1 Byte 0
2
0 15
A[1:0]=10
Figure 4.5 Word Data Writing to a 16-bit Device
Byte 1 Byte 0
1
0 15
A[1:0]=00
Byte 1 Byte 0
2
0 15
A[1:0]=10
Figure 4.6 Word Data Reading from a 16-bit Device
Byte 1 Byte 0
1
15
A[1:0]= 0
Destination (16-bit device)
Byte 1 Byte 0
1
15
A[1:0]= 0
Destination (16-bit device)
Figure 4.7 Half-word Data Writing to a 16-bit Device
Byte 1 Byte 0
1
15
A[1:0]= 0
Source (16-bit device)
Byte 1 Byte 0
1
15
A[1:0]= 0
Source (16-bit device)
Figure 4.8 Half-word Data Reading from a 16-bit Device
Bus operation
0
No.
A1 A0 #WRH #WRL
1
0 0 0
0
2
1 0 0
Bus operation
0
No.
A1 A0 #WRH #WRL
1
0 0 0
0
2
1 0 0
Bus operation
0
No.
A1 A0 #WRH #WRL
1
0 0 1
0
2
1 0 1
Bus operation
0
No.
A1 A0 #WRH #WRL
1
0 0 1
0
2
1 0 1
Bus operation
0
No.
A1 A0 #WRH #WRL
1
0 0
0
Bus operation
0
No.
A1 A0 #WRH #WRL
1
0 0
0
Bus operation
0
No.
A1 A0 #WRH #WRL
1
0 1
0
Bus operation
0
No.
A1 A0 #WRH #WRL
1
0 1
0
EPSON
Data bus
15
Byte 1 Byte 0
0
Byte 3 Byte 2
0
Data bus
15
Byte 3 Byte 2
0
Byte 1 Byte 0
0
Data bus
15
Byte 1 Byte 0
1
Byte 3 Byte 2
1
Data bus
15
Byte 3 Byte 2
1
Byte 1 Byte 0
1
Data bus
15
Byte 1 Byte 0
0
Data bus
15
Byte 1 Byte 0
0
Data bus
15
Byte 1 Byte 0
1
Data bus
15
Byte 1 Byte 0
1
S1C33L03 FUNCTION PART
0
0
0
0
0
0
0
0