p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 541
p2125vps20
Manufacturer Part Number
p2125vps20
Description
16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.P2125VPS20.pdf
(700 pages)
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Section 19 Flash Memory (0.18-µm F-ZTAT Version)
The difference between the programming procedures in user program mode and user boot mode is
whether the MAT is switched or not as shown in figure 19.14.
In user boot mode, the user boot MAT can be seen in the flash memory space with the user MAT
hidden in the background. The user MAT and user boot MAT are switched only while the user
MAT is being programmed. Because the user boot MAT is hidden while the user MAT is being
programmed, the procedure program must be executed in an area other than flash memory. After
the programming procedure completes, switch the MATs again to return to the first state.
MAT switching is enabled by writing a specific value to FMATS. Note however 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 19.6,
Switching between User MAT and User Boot MAT.
Except for MAT switching, the programming 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 and user
MAT) is shown in section 19.4.4, Storable Areas for Procedure Program and Program Data.
Rev. 1.00 Sep. 21, 2006 Page 503 of 658
REJ09B0310-0100
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