Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Technical Manual page 192

II CORE BLOCK: BCU (Bus Control Unit)
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
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-4-16
Byte 1 Byte 0
2 1
8 0 8
A[1:0]= 1 A[1:0]= 0
Destination (8-bit device)
Byte 1 Byte 0
1 2
8 0 8
A[1:0]= 0 A[1:0]= 1
Destination (8-bit device)
Figure 4.13 Half-word Data Writing to an 8-bit Device
Byte 1 Byte 0
2 1
8 0 8
A[1:0]= 1 A[1:0]= 0
Source (8-bit device)
Byte 1 Byte 0
1 2
8 0 8
A[1:0]= 0 A[1:0]= 1
Figure 4.14 Half-word Data Reading from an 8-bit Device
Byte 1 Byte 0
1
8
A[1:0]=
Destination (8-bit device)
Byte 1 Byte 0
1
8
A[1:0]=
Destination (8-bit device)
Figure 4.15 Byte Data Writing to an 8-bit Device
Byte 0
1
8
A[1:0]=
Source (8-bit device)
Byte 0
1
8
A[1:0]=
Source (8-bit device)
Figure 4.16 Byte Data Reading from an 8-bit Device
EPSON
Bus operation
0
No.
A1 A0 #WRH #WRL
1
0 X 0
0
2
1 X 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 X 1
0
2
1 X 1
Bus operation
0
No.
A1 A0 #WRH #WRL
1
0 1 1
0
2
1 1 1
Bus operation
0
No.
A1 A0 #WRH #WRL
1
X 0
0
Bus operation
0
No.
A1 A0 #WRH #WRL
1
0 1
0
Bus operation
0
No.
A1 A0 #WRH #WRL
1
X 1
0
Bus operation
0
No.
A1 A0 #WRH #WRL
1
1 1
0
Data bus
15 0
Data retained Byte 0
Data retained Byte 1
(X: Not connected/Unused)
Data bus
15 0
Byte 1 Data retained
Byte 0 Data retained
( : Uniformly 1 or 0)
Data bus
15 0
Ignored Byte 0
Ignored Byte 1
(X: Not connected/Unused)
Data bus
15 0
Byte 1 Ignored
Byte 0 Ignored
( : Uniformly 1 or 0)
Data bus
15 0
Data retained Byte 0
(X: Not connected/Unused)
Data bus
15 0
Byte 0 Data retained
Data bus
15 0
Ignored Byte 0
(X: Not connected/Unused)
Data bus
15 0
Byte 0 Ignored
S1C33L03 FUNCTION PART