TMP92CF30
2009-06-15
92CF30-154
(2)
Memory Access Operations After Reset
After reset, external memory is accessed using the initial data bus width that is
determined by the AM1 and AM0 pins. The settings of the AM1 and AM0 pins and their
corresponding operation modes are as follows:
Note: The memory that is used for booting after reset must be either NOR-Flash or Masked-ROM. NAND-Flash and
SDRAM cannot be used.
The values of AM1 and AM0 are effective only upon reset. The data bus width is
specified by the <BnBUS1:BnBUS0> bits of the control registers at any other timing.
Upon reset, only the control registers (B2CSH and B2CSL) for the CS2 space
automatically becomes effective. (The B2CSH<B2E> bit is set to 1 upon reset.).Then, the
AM1 and AM0 values that specify the data bus width are loaded into the data bus width
specification bits of the control register for the CS2 space.At the same time, the address
range ebtween 000000H and FFFFFFH is defined as the CS2 space. (The B2CSH<B2M>
is cleared to 0.)
Then, the address spaces are configured by MSARn and MAMRn. The BnCSH and
BnCSL registers are also set up. The BnCSH<BnE> must be set to 1 to enable these
settings.
AM1 AM0
Start
Mode
0 0
Don’t use this setting
0
1
16-bit external bus starting (Note)
1 0
32-bit external bus starting
(Note)
1 1
Don’t use this setting
Содержание TLCS-900/H1 Series
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