h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 450
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h8s-2172
Manufacturer Part Number
h8s-2172
Description
Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2172.pdf
(570 pages)
- Current page: 450 of 570
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MAT switching is enabled by writing a specific value to FMATS. However note that while the
MATs are being switched, the LSI is in an unstable state, e.g. access to a MAT is not allowed until
MAT switching is completed, and if an interrupt occurs, from which MAT the interrupt vector is
read is undetermined. Perform MAT switching in accordance with the description in section 14.6,
Switching between User MAT and User Boot MAT.
Except for MAT switching, the erasing procedure is the same as that in user program mode.
The area that can be executed in the steps of the user procedure program (on-chip RAM, user
MAT, and external space) is shown in section 14.4.4, Procedure Program and Storable Area for
Programming Data.
14.4.4
In the descriptions in the previous section, the programming/erasing procedure programs and
storable areas for program data are assumed to be in the on-chip RAM. However, the program and
the data can be stored in and executed from other areas, such as part of flash memory which is not
to be programmed or erased, or somewhere in the external address space.
Conditions that Apply to Programming/Erasing:
1. The on-chip programming/erasing program is downloaded from the address in the on-chip
2. The on-chip programming/erasing program will use 128 bytes at the maximum as a stack. So,
3. Download by setting the SCO bit to 1 will lead to switching of the MAT. If, therefore, this
4. The flash memory is accessible until the start of programming or erasing, that is, until the
5. The flash memory is not accessible during programming/erasing operations, therefore, the
Rev. 2.00, 03/04, page 418 of 534
RAM specified by FTDAR, therefore, this area is not available for use.
make sure that this area is secured.
operation is used, it should be executed from the on-chip RAM.
result of downloading has been determined. When in a mode in which the external address
space is not accessible, such as single-chip mode, the required procedure programs, NMI
handling vector and NMI handler should be transferred to the on-chip RAM before
programming/erasing of the flash memory starts.
operation program is downloaded to the on-chip RAM to be executed. The NMI-handling
vector and programs such as that which activate the operation program, and NMI handler
should thus be stored in on-chip memory other than flash memory or the external address
space.
Procedure Program and Storable Area for Programming Data
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