Epson S1C33210 Technical Manual page 166

II CORE BLOCK: BCU (Bus Control Unit)
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
Little-endian
Source (general-purpose register)
31
Byte 3 Byte 2
4 3
8 0 8
A[1:0]=11 A[1:0]=10
Destination (8-bit device)
Big-endian
Source (general-purpose register)
31
Byte 3 Byte 2
1 2
8 0 8
A[1:0]=00 A[1:0]=01
Destination (8-bit device)
B-II-4-14
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
Byte 1 Byte 0
1 1'
15
A[1:0]= 1 A[1:0]= 0
Destination (16-bit device)
Byte 1 Byte 0
1 1'
15
A[1:0]= 0 A[1:0]= 1
Destination (16-bit device)
Figure 4.9 Byte Data Writing to a 16-bit Device
RD byte
1 1'
15
A[1:0]= 1 A[1:0]= 0
Source (16-bit device)
RD byte
1 1'
15
A[1:0]= 0 A[1:0]= 1
Source (16-bit device)
Figure 4.10 Byte Data Reading from a 16-bit Device
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 4.11 Word Data Writing to an 8-bit Device
0
No.
A1 A0 #WRH #WRL
1
0 1
0
0
No.
A1 A0 #WRH #WRL
1
0 1
0
0
No.
A1 A0 #WRH #WRL
1
1 0
0
1'
0 1
0
No.
A1 A0 #WRH #WRL
1
0 0
0
1'
1 1
0
No.
A1 A0 #WRH #WRL
1
1 1
0
1'
0 1
0
No.
A1 A0 #WRH #WRL
1
0 1
0
1'
1 1
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 0
0
2
0 1 0
3
1 0 0
4
1 1 0
EPSON
Bus operation
Data bus
15
Byte 1 Byte 0
1
Bus operation
Data bus
15
Byte 1 Byte 0
1
Bus operation
Data bus
15
Byte 0 Data retained
1
Data retained Byte 0
0
Bus operation
Data bus
15
Byte 0 Data retained
1
Data retained Byte 0
0
Bus operation
Data bus
15
RD byte Ignored
1
Ignored RD byte
1
Bus operation
Data bus
15
RD byte Ignored
1
Ignored RD byte
1
Bus operation
Data bus
15
Data retained Byte 0
0
Data retained Byte 1
0
Data retained Byte 2
0
Data retained Byte 3
0
(X: Not connected/Unused)
Bus operation
Data bus
15
Byte 3 Data retained
1
Byte 2 Data retained
1
Byte 1 Data retained
1
Byte 0 Data retained
1
S1C33210 FUNCTION PART
0
0
0
0
0
0
0
0