Epson S1C33210 Technical Manual page 167

Little-endian
Destination (general-purpose register)
31
Byte 3 Byte 2
4 3
8 0 8
A[1:0]=11 A[1:0]=10
Source (8-bit device)
Big-endian
Destination (general-purpose register)
31
Byte 3 Byte 2
1 2
8 0 8
A[1:0]=00 A[1:0]=01
Source (8-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
Little-endian
Source (general-purpose register)
31
Byte 3 Byte 2
Big-endian
Source (general-purpose register)
31
Byte 3 Byte 2
S1C33210 FUNCTION PART
Byte 1 Byte 0
2 1
0 8 0 8
A[1:0]=01 A[1:0]=00
Byte 1 Byte 0
3 4
0 8 0 8
A[1:0]=10 A[1:0]=11
Figure 4.12 Word Data Reading from an 8-bit Device
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
II CORE BLOCK: BCU (Bus Control Unit)
0
No.
A1 A0 #WRH #WRL
1
0 0 X
0
2
0 1 X
3
1 0 X
4
1 1 X
0
No.
A1 A0 #WRH #WRL
1
0 0 1
0
2
0 1 1
3
1 0 1
4
1 1 1
0
No.
A1 A0 #WRH #WRL
1
0 X
0
2
1 X
0
No.
A1 A0 #WRH #WRL
1
0 0
0
2
1 0
0
No.
A1 A0 #WRH #WRL
1
0 X
0
2
1 X
0
No.
A1 A0 #WRH #WRL
1
0 1
0
2
1 1
0
No.
A1 A0 #WRH #WRL
1
X
0
0
No.
A1 A0 #WRH #WRL
1
0
0
EPSON
Bus operation
Data bus
15
Ignored Byte 0
1
Ignored Byte 1
1
Ignored Byte 2
1
Ignored Byte 3
1
(X: Not connected/Unused)
Bus operation
Data bus
15
Byte 3 Ignored
1
Byte 2 Ignored
1
Byte 1 Ignored
1
Byte 0 Ignored
1
Bus operation
Data bus
15
Data retained Byte 0
0
Data retained Byte 1
0
(X: Not connected/Unused)
Bus operation
Data bus
15
Byte 1 Data retained
0
Byte 0 Data retained
0
( : Uniformly 1 or 0)
Bus operation
Data bus
15
Ignored Byte 0
1
Ignored Byte 1
1
(X: Not connected/Unused)
Bus operation
Data bus
15
Byte 1 Ignored
1
Byte 0 Ignored
1
( : Uniformly 1 or 0)
Bus operation
Data bus
15
Data retained Byte 0
0
(X: Not connected/Unused)
Bus operation
Data bus
15
Byte 0 Data retained
1
0
0
0
0
0
0
0
0
B-II-4-15