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PC312XDP512F0CFVR Datasheet(PDF) 798 Page - Freescale Semiconductor, Inc

Part # PC312XDP512F0CFVR
Description  HCS12X Microcontrollers
PDF  1348 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PC312XDP512F0CFVR Datasheet(HTML) 798 Page - Freescale Semiconductor, Inc

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Chapter 21 External Bus Interface (S12XEBIV2)
MC9S12XDP512 Data Sheet, Rev. 2.21
800
Freescale Semiconductor
21.4.5.2
Emulation Modes and Special Test Mode
In emulation modes and special test mode, the external signals LSTRB, R/W, and ADDR0 indicate the
access type (read/write), data size and alignment of an external bus access. Misaligned accesses to the
internal RAM and misaligned XGATE PRR accesses in emulation modes are the only type of access that
are able to produce LSTRB = ADDR0 = 1. This is summarized in Table 21-18.
Table 21-17. Access in Normal Expanded Mode
Access
RE WE UDS LDS
DATA[15:8]
DATA[7:0]
I/O data(addr) I/O data(addr)
Word write of data on DATA[15:0] at an even and even+1 address
1
0
0
0
Out data(even) Out
data(odd)
Byte write of data on DATA[7:0] at an odd address
1
0
1
0
In
x
Out
data(odd)
Byte write of data on DATA[15:8] at an even address
1
0
0
1
Out data(even)
In
x
Word read of data on DATA[15:0] at an even and even+1 address
0
1
0
0
In
data(even)
In
data(odd)
Byte read of data on DATA[7:0] at an odd address
0
1
1
0
In
x
In
data(odd)
Byte read of data on DATA[15:8] at an even address
0
1
0
1
In
data(even)
In
x
Indicates No Access
1
1
1
1
In
x
In
x
Unimplemented
1
1
1
0
In
x
In
x
11
0
1
In
x
In
x
Table 21-18. Access in Emulation Modes and Special Test Mode
Access
R/W LSTRB ADDR0
DATA[15:8]
DATA[7:0]
I/O
data(addr)
I/O
data(addr)
Word write of data on DATA[15:0] at an even and even+1
address
0
0
0
Out
data(even)
Out
data(odd)
Byte write of data on DATA[7:0] at an odd address
0
0
1
In
x
Out
data(odd)
Byte write of data on DATA[15:8] at an even address
0
1
0
Out
data(odd)
In
x
Word write at an odd and odd+1 internal RAM address
(misaligned — only in emulation modes)
0
1
1
Out data(odd+1) Out
data(odd)
Word read of data on DATA[15:0] at an even and even+1
address
1
0
0
In
data(even)
In
data(even+1)
Byte read of data on DATA[7:0] at an odd address
1
0
1
In
x
In
data(odd)
Byte read of data on DATA[15:8] at an even address
1
1
0
In
data(even)
In
x
Word read at an odd and odd+1 internal RAM address
(misaligned - only in emulation modes)
1
1
1
In
data(odd+1)
In
data(odd)



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