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Epson S1C33L03 Manual Do Utilizador

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II CORE BLOCK: BCU (Bus Control Unit)
B-II-4-16
EPSON
S1C33L03 FUNCTION PART
Data retained
15              
Data bus
              0
#WRL
0
0
#WRH
X
X
A0
0
1
A1
∗
∗
No.
1
2
Byte 0
Data retained
Byte 1
Byte 3
Byte 2
Byte 1
Byte 0
31
0
A[1:0]=
∗
0
A[1:0]=
∗
1
0
1
8
8
0
Source (general-purpose register)
Destination (8-bit device)
2
Bus operation
(X: Not connected/Unused)
Little-endian
Byte 1
15              
Data bus
              0
#WRL
0
0
#WRH
0
0
A0
0
1
A1
∗
∗
No.
1
2
Data retained
Byte 0
Data retained
Byte 3
Byte 2
Byte 1
Byte 0
31
0
A[1:0]=
∗
1
A[1:0]=
∗
0
0
2
8
8
0
Source (general-purpose register)
Destination (8-bit device)
1
Bus operation
(
∗
: Uniformly 1 or 0)
Big-endian
Figure 4.13  Half-word Data Writing to an 8-bit Device
Ignored
15              
Data bus
              0
#WRL
1
1
#WRH
X
X
A0
0
1
A1
∗
∗
No.
1
2
Byte 0
Ignored
Byte 1
Byte 1
Byte 0
31
0
A[1:0]=
∗
0
A[1:0]=
∗
1
0
1
8
8
0
2
Bus operation
(X: Not connected/Unused)
Destination (general-purpose register)
Source (8-bit device)
Sign or Zero extension
Little-endian
Byte 1
15              
Data bus
              0
#WRL
1
1
#WRH
1
1
A0
0
1
A1
∗
∗
No.
1
2
Ignored
Byte 0
Ignored
Byte 1
Byte 0
31
0
A[1:0]=
∗
1
A[1:0]=
∗
0
0
2
8
8
0
1
Bus operation
Destination (general-purpose register)
Sign or Zero extension
Big-endian
(
∗
: Uniformly 1 or 0)
Figure 4.14  Half-word Data Reading from an 8-bit Device
Data retained
15              
Data bus
              0
#WRL
0
#WRH
X
A0
∗
A1
∗
No.
1
Byte 0
Byte 3
Byte 2
Byte 1
Byte 0
31
0
A[1:0]=
∗∗
0
1
8
Source (general-purpose register)
Destination (8-bit device)
Bus operation
(X: Not connected/Unused)
Little-endian
Byte 0
15              
Data bus
              0
#WRL
1
#WRH
0
A0
∗
A1
∗
No.
1
Data retained
Byte 3
Byte 2
Byte 1
Byte 0
31
0
A[1:0]=
∗∗
0
1
8
Source (general-purpose register)
Destination (8-bit device)
Bus operation
Big-endian
Figure 4.15  Byte Data Writing to an 8-bit Device
Ignored
15              
Data bus
              0
#WRL
1
#WRH
X
A0
∗
A1
∗
No.
1
Byte 0
Byte 0
31
0
A[1:0]=
∗∗
0
1
8
Bus operation
(X: Not connected/Unused)
Destination (general-purpose register)
Source (8-bit device)
Sign or Zero extension
Little-endian
Byte 0
15              
Data bus
              0
#WRL
1
#WRH
1
A0
∗
A1
∗
No.
1
Ignored
Byte 0
31
0
A[1:0]=
∗∗
0
1
8
Bus operation
Destination (general-purpose register)
Source (8-bit device)
Sign or Zero extension
Big-endian
Figure 4.16  Byte Data Reading from an 8-bit Device